| /* |
| * linux/lib/vsprintf.c |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| */ |
| |
| /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ |
| /* |
| * Wirzenius wrote this portably, Torvalds fucked it up :-) |
| */ |
| |
| /* |
| * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
| * - changed to provide snprintf and vsnprintf functions |
| * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> |
| * - scnprintf and vscnprintf |
| */ |
| |
| #include <stdarg.h> |
| #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/ctype.h> |
| #include <linux/kernel.h> |
| #include <linux/kallsyms.h> |
| #include <linux/uaccess.h> |
| #include <linux/ioport.h> |
| #include <net/addrconf.h> |
| |
| #include <asm/page.h> /* for PAGE_SIZE */ |
| #include <asm/div64.h> |
| #include <asm/sections.h> /* for dereference_function_descriptor() */ |
| |
| #include "kstrtox.h" |
| |
| /** |
| * simple_strtoull - convert a string to an unsigned long long |
| * @cp: The start of the string |
| * @endp: A pointer to the end of the parsed string will be placed here |
| * @base: The number base to use |
| */ |
| unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
| { |
| unsigned long long result; |
| unsigned int rv; |
| |
| cp = _parse_integer_fixup_radix(cp, &base); |
| rv = _parse_integer(cp, base, &result); |
| /* FIXME */ |
| cp += (rv & ~KSTRTOX_OVERFLOW); |
| |
| if (endp) |
| *endp = (char *)cp; |
| |
| return result; |
| } |
| EXPORT_SYMBOL(simple_strtoull); |
| |
| /** |
| * simple_strtoul - convert a string to an unsigned long |
| * @cp: The start of the string |
| * @endp: A pointer to the end of the parsed string will be placed here |
| * @base: The number base to use |
| */ |
| unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
| { |
| return simple_strtoull(cp, endp, base); |
| } |
| EXPORT_SYMBOL(simple_strtoul); |
| |
| /** |
| * simple_strtol - convert a string to a signed long |
| * @cp: The start of the string |
| * @endp: A pointer to the end of the parsed string will be placed here |
| * @base: The number base to use |
| */ |
| long simple_strtol(const char *cp, char **endp, unsigned int base) |
| { |
| if (*cp == '-') |
| return -simple_strtoul(cp + 1, endp, base); |
| |
| return simple_strtoul(cp, endp, base); |
| } |
| EXPORT_SYMBOL(simple_strtol); |
| |
| /** |
| * simple_strtoll - convert a string to a signed long long |
| * @cp: The start of the string |
| * @endp: A pointer to the end of the parsed string will be placed here |
| * @base: The number base to use |
| */ |
| long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
| { |
| if (*cp == '-') |
| return -simple_strtoull(cp + 1, endp, base); |
| |
| return simple_strtoull(cp, endp, base); |
| } |
| EXPORT_SYMBOL(simple_strtoll); |
| |
| static noinline_for_stack |
| int skip_atoi(const char **s) |
| { |
| int i = 0; |
| |
| while (isdigit(**s)) |
| i = i*10 + *((*s)++) - '0'; |
| |
| return i; |
| } |
| |
| /* Decimal conversion is by far the most typical, and is used |
| * for /proc and /sys data. This directly impacts e.g. top performance |
| * with many processes running. We optimize it for speed |
| * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
| * (with permission from the author, Douglas W. Jones). |
| */ |
| |
| #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
| /* Formats correctly any integer in [0, 999999999] */ |
| static noinline_for_stack |
| char *put_dec_full9(char *buf, unsigned q) |
| { |
| unsigned r; |
| |
| /* |
| * Possible ways to approx. divide by 10 |
| * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) |
| * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) |
| * (x * 0x6667) >> 18 x < 43699 |
| * (x * 0x3334) >> 17 x < 16389 |
| * (x * 0x199a) >> 16 x < 16389 |
| * (x * 0x0ccd) >> 15 x < 16389 |
| * (x * 0x0667) >> 14 x < 2739 |
| * (x * 0x0334) >> 13 x < 1029 |
| * (x * 0x019a) >> 12 x < 1029 |
| * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) |
| * (x * 0x0067) >> 10 x < 179 |
| * (x * 0x0034) >> 9 x < 69 same |
| * (x * 0x001a) >> 8 x < 69 same |
| * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) |
| * (x * 0x0007) >> 6 x < 19 |
| * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
| */ |
| r = (q * (uint64_t)0x1999999a) >> 32; |
| *buf++ = (q - 10 * r) + '0'; /* 1 */ |
| q = (r * (uint64_t)0x1999999a) >> 32; |
| *buf++ = (r - 10 * q) + '0'; /* 2 */ |
| r = (q * (uint64_t)0x1999999a) >> 32; |
| *buf++ = (q - 10 * r) + '0'; /* 3 */ |
| q = (r * (uint64_t)0x1999999a) >> 32; |
| *buf++ = (r - 10 * q) + '0'; /* 4 */ |
| r = (q * (uint64_t)0x1999999a) >> 32; |
| *buf++ = (q - 10 * r) + '0'; /* 5 */ |
| /* Now value is under 10000, can avoid 64-bit multiply */ |
| q = (r * 0x199a) >> 16; |
| *buf++ = (r - 10 * q) + '0'; /* 6 */ |
| r = (q * 0xcd) >> 11; |
| *buf++ = (q - 10 * r) + '0'; /* 7 */ |
| q = (r * 0xcd) >> 11; |
| *buf++ = (r - 10 * q) + '0'; /* 8 */ |
| *buf++ = q + '0'; /* 9 */ |
| return buf; |
| } |
| #endif |
| |
| /* Similar to above but do not pad with zeros. |
| * Code can be easily arranged to print 9 digits too, but our callers |
| * always call put_dec_full9() instead when the number has 9 decimal digits. |
| */ |
| static noinline_for_stack |
| char *put_dec_trunc8(char *buf, unsigned r) |
| { |
| unsigned q; |
| |
| /* Copy of previous function's body with added early returns */ |
| while (r >= 10000) { |
| q = r + '0'; |
| r = (r * (uint64_t)0x1999999a) >> 32; |
| *buf++ = q - 10*r; |
| } |
| |
| q = (r * 0x199a) >> 16; /* r <= 9999 */ |
| *buf++ = (r - 10 * q) + '0'; |
| if (q == 0) |
| return buf; |
| r = (q * 0xcd) >> 11; /* q <= 999 */ |
| *buf++ = (q - 10 * r) + '0'; |
| if (r == 0) |
| return buf; |
| q = (r * 0xcd) >> 11; /* r <= 99 */ |
| *buf++ = (r - 10 * q) + '0'; |
| if (q == 0) |
| return buf; |
| *buf++ = q + '0'; /* q <= 9 */ |
| return buf; |
| } |
| |
| /* There are two algorithms to print larger numbers. |
| * One is generic: divide by 1000000000 and repeatedly print |
| * groups of (up to) 9 digits. It's conceptually simple, |
| * but requires a (unsigned long long) / 1000000000 division. |
| * |
| * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, |
| * manipulates them cleverly and generates groups of 4 decimal digits. |
| * It so happens that it does NOT require long long division. |
| * |
| * If long is > 32 bits, division of 64-bit values is relatively easy, |
| * and we will use the first algorithm. |
| * If long long is > 64 bits (strange architecture with VERY large long long), |
| * second algorithm can't be used, and we again use the first one. |
| * |
| * Else (if long is 32 bits and long long is 64 bits) we use second one. |
| */ |
| |
| #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
| |
| /* First algorithm: generic */ |
| |
| static |
| char *put_dec(char *buf, unsigned long long n) |
| { |
| if (n >= 100*1000*1000) { |
| while (n >= 1000*1000*1000) |
| buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); |
| if (n >= 100*1000*1000) |
| return put_dec_full9(buf, n); |
| } |
| return put_dec_trunc8(buf, n); |
| } |
| |
| #else |
| |
| /* Second algorithm: valid only for 64-bit long longs */ |
| |
| /* See comment in put_dec_full9 for choice of constants */ |
| static noinline_for_stack |
| void put_dec_full4(char *buf, unsigned q) |
| { |
| unsigned r; |
| r = (q * 0xccd) >> 15; |
| buf[0] = (q - 10 * r) + '0'; |
| q = (r * 0xcd) >> 11; |
| buf[1] = (r - 10 * q) + '0'; |
| r = (q * 0xcd) >> 11; |
| buf[2] = (q - 10 * r) + '0'; |
| buf[3] = r + '0'; |
| } |
| |
| /* |
| * Call put_dec_full4 on x % 10000, return x / 10000. |
| * The approximation x/10000 == (x * 0x346DC5D7) >> 43 |
| * holds for all x < 1,128,869,999. The largest value this |
| * helper will ever be asked to convert is 1,125,520,955. |
| * (d1 in the put_dec code, assuming n is all-ones). |
| */ |
| static |
| unsigned put_dec_helper4(char *buf, unsigned x) |
| { |
| uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; |
| |
| put_dec_full4(buf, x - q * 10000); |
| return q; |
| } |
| |
| /* Based on code by Douglas W. Jones found at |
| * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> |
| * (with permission from the author). |
| * Performs no 64-bit division and hence should be fast on 32-bit machines. |
| */ |
| static |
| char *put_dec(char *buf, unsigned long long n) |
| { |
| uint32_t d3, d2, d1, q, h; |
| |
| if (n < 100*1000*1000) |
| return put_dec_trunc8(buf, n); |
| |
| d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ |
| h = (n >> 32); |
| d2 = (h ) & 0xffff; |
| d3 = (h >> 16); /* implicit "& 0xffff" */ |
| |
| q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
| q = put_dec_helper4(buf, q); |
| |
| q += 7671 * d3 + 9496 * d2 + 6 * d1; |
| q = put_dec_helper4(buf+4, q); |
| |
| q += 4749 * d3 + 42 * d2; |
| q = put_dec_helper4(buf+8, q); |
| |
| q += 281 * d3; |
| buf += 12; |
| if (q) |
| buf = put_dec_trunc8(buf, q); |
| else while (buf[-1] == '0') |
| --buf; |
| |
| return buf; |
| } |
| |
| #endif |
| |
| /* |
| * Convert passed number to decimal string. |
| * Returns the length of string. On buffer overflow, returns 0. |
| * |
| * If speed is not important, use snprintf(). It's easy to read the code. |
| */ |
| int num_to_str(char *buf, int size, unsigned long long num) |
| { |
| char tmp[sizeof(num) * 3]; |
| int idx, len; |
| |
| /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
| if (num <= 9) { |
| tmp[0] = '0' + num; |
| len = 1; |
| } else { |
| len = put_dec(tmp, num) - tmp; |
| } |
| |
| if (len > size) |
| return 0; |
| for (idx = 0; idx < len; ++idx) |
| buf[idx] = tmp[len - idx - 1]; |
| return len; |
| } |
| |
| #define ZEROPAD 1 /* pad with zero */ |
| #define SIGN 2 /* unsigned/signed long */ |
| #define PLUS 4 /* show plus */ |
| #define SPACE 8 /* space if plus */ |
| #define LEFT 16 /* left justified */ |
| #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
| #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ |
| |
| enum format_type { |
| FORMAT_TYPE_NONE, /* Just a string part */ |
| FORMAT_TYPE_WIDTH, |
| FORMAT_TYPE_PRECISION, |
| FORMAT_TYPE_CHAR, |
| FORMAT_TYPE_STR, |
| FORMAT_TYPE_PTR, |
| FORMAT_TYPE_PERCENT_CHAR, |
| FORMAT_TYPE_INVALID, |
| FORMAT_TYPE_LONG_LONG, |
| FORMAT_TYPE_ULONG, |
| FORMAT_TYPE_LONG, |
| FORMAT_TYPE_UBYTE, |
| FORMAT_TYPE_BYTE, |
| FORMAT_TYPE_USHORT, |
| FORMAT_TYPE_SHORT, |
| FORMAT_TYPE_UINT, |
| FORMAT_TYPE_INT, |
| FORMAT_TYPE_NRCHARS, |
| FORMAT_TYPE_SIZE_T, |
| FORMAT_TYPE_PTRDIFF |
| }; |
| |
| struct printf_spec { |
| u8 type; /* format_type enum */ |
| u8 flags; /* flags to number() */ |
| u8 base; /* number base, 8, 10 or 16 only */ |
| u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ |
| s16 field_width; /* width of output field */ |
| s16 precision; /* # of digits/chars */ |
| }; |
| |
| static noinline_for_stack |
| char *number(char *buf, char *end, unsigned long long num, |
| struct printf_spec spec) |
| { |
| /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
| static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ |
| |
| char tmp[66]; |
| char sign; |
| char locase; |
| int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
| int i; |
| bool is_zero = num == 0LL; |
| |
| /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
| * produces same digits or (maybe lowercased) letters */ |
| locase = (spec.flags & SMALL); |
| if (spec.flags & LEFT) |
| spec.flags &= ~ZEROPAD; |
| sign = 0; |
| if (spec.flags & SIGN) { |
| if ((signed long long)num < 0) { |
| sign = '-'; |
| num = -(signed long long)num; |
| spec.field_width--; |
| } else if (spec.flags & PLUS) { |
| sign = '+'; |
| spec.field_width--; |
| } else if (spec.flags & SPACE) { |
| sign = ' '; |
| spec.field_width--; |
| } |
| } |
| if (need_pfx) { |
| if (spec.base == 16) |
| spec.field_width -= 2; |
| else if (!is_zero) |
| spec.field_width--; |
| } |
| |
| /* generate full string in tmp[], in reverse order */ |
| i = 0; |
| if (num < spec.base) |
| tmp[i++] = digits[num] | locase; |
| /* Generic code, for any base: |
| else do { |
| tmp[i++] = (digits[do_div(num,base)] | locase); |
| } while (num != 0); |
| */ |
| else if (spec.base != 10) { /* 8 or 16 */ |
| int mask = spec.base - 1; |
| int shift = 3; |
| |
| if (spec.base == 16) |
| shift = 4; |
| do { |
| tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
| num >>= shift; |
| } while (num); |
| } else { /* base 10 */ |
| i = put_dec(tmp, num) - tmp; |
| } |
| |
| /* printing 100 using %2d gives "100", not "00" */ |
| if (i > spec.precision) |
| spec.precision = i; |
| /* leading space padding */ |
| spec.field_width -= spec.precision; |
| if (!(spec.flags & (ZEROPAD+LEFT))) { |
| while (--spec.field_width >= 0) { |
| if (buf < end) |
| *buf = ' '; |
| ++buf; |
| } |
| } |
| /* sign */ |
| if (sign) { |
| if (buf < end) |
| *buf = sign; |
| ++buf; |
| } |
| /* "0x" / "0" prefix */ |
| if (need_pfx) { |
| if (spec.base == 16 || !is_zero) { |
| if (buf < end) |
| *buf = '0'; |
| ++buf; |
| } |
| if (spec.base == 16) { |
| if (buf < end) |
| *buf = ('X' | locase); |
| ++buf; |
| } |
| } |
| /* zero or space padding */ |
| if (!(spec.flags & LEFT)) { |
| char c = (spec.flags & ZEROPAD) ? '0' : ' '; |
| while (--spec.field_width >= 0) { |
| if (buf < end) |
| *buf = c; |
| ++buf; |
| } |
| } |
| /* hmm even more zero padding? */ |
| while (i <= --spec.precision) { |
| if (buf < end) |
| *buf = '0'; |
| ++buf; |
| } |
| /* actual digits of result */ |
| while (--i >= 0) { |
| if (buf < end) |
| *buf = tmp[i]; |
| ++buf; |
| } |
| /* trailing space padding */ |
| while (--spec.field_width >= 0) { |
| if (buf < end) |
| *buf = ' '; |
| ++buf; |
| } |
| |
| return buf; |
| } |
| |
| static noinline_for_stack |
| char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
| { |
| int len, i; |
| |
| if ((unsigned long)s < PAGE_SIZE) |
| s = "(null)"; |
| |
| len = strnlen(s, spec.precision); |
| |
| if (!(spec.flags & LEFT)) { |
| while (len < spec.field_width--) { |
| if (buf < end) |
| *buf = ' '; |
| ++buf; |
| } |
| } |
| for (i = 0; i < len; ++i) { |
| if (buf < end) |
| *buf = *s; |
| ++buf; ++s; |
| } |
| while (len < spec.field_width--) { |
| if (buf < end) |
| *buf = ' '; |
| ++buf; |
| } |
| |
| return buf; |
| } |
| |
| static noinline_for_stack |
| char *symbol_string(char *buf, char *end, void *ptr, |
| struct printf_spec spec, char ext) |
| { |
| unsigned long value = (unsigned long) ptr; |
| #ifdef CONFIG_KALLSYMS |
| char sym[KSYM_SYMBOL_LEN]; |
| if (ext == 'B') |
| sprint_backtrace(sym, value); |
| else if (ext != 'f' && ext != 's') |
| sprint_symbol(sym, value); |
| else |
| sprint_symbol_no_offset(sym, value); |
| |
| return string(buf, end, sym, spec); |
| #else |
| spec.field_width = 2 * sizeof(void *); |
| spec.flags |= SPECIAL | SMALL | ZEROPAD; |
| spec.base = 16; |
| |
| return number(buf, end, value, spec); |
| #endif |
| } |
| |
| static noinline_for_stack |
| char *resource_string(char *buf, char *end, struct resource *res, |
| struct printf_spec spec, const char *fmt) |
| { |
| #ifndef IO_RSRC_PRINTK_SIZE |
| #define IO_RSRC_PRINTK_SIZE 6 |
| #endif |
| |
| #ifndef MEM_RSRC_PRINTK_SIZE |
| #define MEM_RSRC_PRINTK_SIZE 10 |
| #endif |
| static const struct printf_spec io_spec = { |
| .base = 16, |
| .field_width = IO_RSRC_PRINTK_SIZE, |
| .precision = -1, |
| .flags = SPECIAL | SMALL | ZEROPAD, |
| }; |
| static const struct printf_spec mem_spec = { |
| .base = 16, |
| .field_width = MEM_RSRC_PRINTK_SIZE, |
| .precision = -1, |
| .flags = SPECIAL | SMALL | ZEROPAD, |
| }; |
| static const struct printf_spec bus_spec = { |
| .base = 16, |
| .field_width = 2, |
| .precision = -1, |
| .flags = SMALL | ZEROPAD, |
| }; |
| static const struct printf_spec dec_spec = { |
| .base = 10, |
| .precision = -1, |
| .flags = 0, |
| }; |
| static const struct printf_spec str_spec = { |
| .field_width = -1, |
| .precision = 10, |
| .flags = LEFT, |
| }; |
| static const struct printf_spec flag_spec = { |
| .base = 16, |
| .precision = -1, |
| .flags = SPECIAL | SMALL, |
| }; |
| |
| /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) |
| * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ |
| #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) |
| #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) |
| #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
| #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
| char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, |
| 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; |
| |
| char *p = sym, *pend = sym + sizeof(sym); |
| int decode = (fmt[0] == 'R') ? 1 : 0; |
| const struct printf_spec *specp; |
| |
| *p++ = '['; |
| if (res->flags & IORESOURCE_IO) { |
| p = string(p, pend, "io ", str_spec); |
| specp = &io_spec; |
| } else if (res->flags & IORESOURCE_MEM) { |
| p = string(p, pend, "mem ", str_spec); |
| specp = &mem_spec; |
| } else if (res->flags & IORESOURCE_IRQ) { |
| p = string(p, pend, "irq ", str_spec); |
| specp = &dec_spec; |
| } else if (res->flags & IORESOURCE_DMA) { |
| p = string(p, pend, "dma ", str_spec); |
| specp = &dec_spec; |
| } else if (res->flags & IORESOURCE_BUS) { |
| p = string(p, pend, "bus ", str_spec); |
| specp = &bus_spec; |
| } else { |
| p = string(p, pend, "??? ", str_spec); |
| specp = &mem_spec; |
| decode = 0; |
| } |
| p = number(p, pend, res->start, *specp); |
| if (res->start != res->end) { |
| *p++ = '-'; |
| p = number(p, pend, res->end, *specp); |
| } |
| if (decode) { |
| if (res->flags & IORESOURCE_MEM_64) |
| p = string(p, pend, " 64bit", str_spec); |
| if (res->flags & IORESOURCE_PREFETCH) |
| p = string(p, pend, " pref", str_spec); |
| if (res->flags & IORESOURCE_WINDOW) |
| p = string(p, pend, " window", str_spec); |
| if (res->flags & IORESOURCE_DISABLED) |
| p = string(p, pend, " disabled", str_spec); |
| } else { |
| p = string(p, pend, " flags ", str_spec); |
| p = number(p, pend, res->flags, flag_spec); |
| } |
| *p++ = ']'; |
| *p = '\0'; |
| |
| return string(buf, end, sym, spec); |
| } |
| |
| static noinline_for_stack |
| char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, |
| const char *fmt) |
| { |
| int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains |
| negative value, fallback to the default */ |
| char separator; |
| |
| if (spec.field_width == 0) |
| /* nothing to print */ |
| return buf; |
| |
| if (ZERO_OR_NULL_PTR(addr)) |
| /* NULL pointer */ |
| return string(buf, end, NULL, spec); |
| |
| switch (fmt[1]) { |
| case 'C': |
| separator = ':'; |
| break; |
| case 'D': |
| separator = '-'; |
| break; |
| case 'N': |
| separator = 0; |
| break; |
| default: |
| separator = ' '; |
| break; |
| } |
| |
| if (spec.field_width > 0) |
| len = min_t(int, spec.field_width, 64); |
| |
| for (i = 0; i < len && buf < end - 1; i++) { |
| buf = hex_byte_pack(buf, addr[i]); |
| |
| if (buf < end && separator && i != len - 1) |
| *buf++ = separator; |
| } |
| |
| return buf; |
| } |
| |
| static noinline_for_stack |
| char *mac_address_string(char *buf, char *end, u8 *addr, |
| struct printf_spec spec, const char *fmt) |
| { |
| char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
| char *p = mac_addr; |
| int i; |
| char separator; |
| bool reversed = false; |
| |
| switch (fmt[1]) { |
| case 'F': |
| separator = '-'; |
| break; |
| |
| case 'R': |
| reversed = true; |
| /* fall through */ |
| |
| default: |
| separator = ':'; |
| break; |
| } |
| |
| for (i = 0; i < 6; i++) { |
| if (reversed) |
| p = hex_byte_pack(p, addr[5 - i]); |
| else |
| p = hex_byte_pack(p, addr[i]); |
| |
| if (fmt[0] == 'M' && i != 5) |
| *p++ = separator; |
| } |
| *p = '\0'; |
| |
| return string(buf, end, mac_addr, spec); |
| } |
| |
| static noinline_for_stack |
| char *ip4_string(char *p, const u8 *addr, const char *fmt) |
| { |
| int i; |
| bool leading_zeros = (fmt[0] == 'i'); |
| int index; |
| int step; |
| |
| switch (fmt[2]) { |
| case 'h': |
| #ifdef __BIG_ENDIAN |
| index = 0; |
| step = 1; |
| #else |
| index = 3; |
| step = -1; |
| #endif |
| break; |
| case 'l': |
| index = 3; |
| step = -1; |
| break; |
| case 'n': |
| case 'b': |
| default: |
| index = 0; |
| step = 1; |
| break; |
| } |
| for (i = 0; i < 4; i++) { |
| char temp[3]; /* hold each IP quad in reverse order */ |
| int digits = put_dec_trunc8(temp, addr[index]) - temp; |
| if (leading_zeros) { |
| if (digits < 3) |
| *p++ = '0'; |
| if (digits < 2) |
| *p++ = '0'; |
| } |
| /* reverse the digits in the quad */ |
| while (digits--) |
| *p++ = temp[digits]; |
| if (i < 3) |
| *p++ = '.'; |
| index += step; |
| } |
| *p = '\0'; |
| |
| return p; |
| } |
| |
| static noinline_for_stack |
| char *ip6_compressed_string(char *p, const char *addr) |
| { |
| int i, j, range; |
| unsigned char zerolength[8]; |
| int longest = 1; |
| int colonpos = -1; |
| u16 word; |
| u8 hi, lo; |
| bool needcolon = false; |
| bool useIPv4; |
| struct in6_addr in6; |
| |
| memcpy(&in6, addr, sizeof(struct in6_addr)); |
| |
| useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); |
| |
| memset(zerolength, 0, sizeof(zerolength)); |
| |
| if (useIPv4) |
| range = 6; |
| else |
| range = 8; |
| |
| /* find position of longest 0 run */ |
| for (i = 0; i < range; i++) { |
| for (j = i; j < range; j++) { |
| if (in6.s6_addr16[j] != 0) |
| break; |
| zerolength[i]++; |
| } |
| } |
| for (i = 0; i < range; i++) { |
| if (zerolength[i] > longest) { |
| longest = zerolength[i]; |
| colonpos = i; |
| } |
| } |
| if (longest == 1) /* don't compress a single 0 */ |
| colonpos = -1; |
| |
| /* emit address */ |
| for (i = 0; i < range; i++) { |
| if (i == colonpos) { |
| if (needcolon || i == 0) |
| *p++ = ':'; |
| *p++ = ':'; |
| needcolon = false; |
| i += longest - 1; |
| continue; |
| } |
| if (needcolon) { |
| *p++ = ':'; |
| needcolon = false; |
| } |
| /* hex u16 without leading 0s */ |
| word = ntohs(in6.s6_addr16[i]); |
| hi = word >> 8; |
| lo = word & 0xff; |
| if (hi) { |
| if (hi > 0x0f) |
| p = hex_byte_pack(p, hi); |
| else |
| *p++ = hex_asc_lo(hi); |
| p = hex_byte_pack(p, lo); |
| } |
| else if (lo > 0x0f) |
| p = hex_byte_pack(p, lo); |
| else |
| *p++ = hex_asc_lo(lo); |
| needcolon = true; |
| } |
| |
| if (useIPv4) { |
| if (needcolon) |
| *p++ = ':'; |
| p = ip4_string(p, &in6.s6_addr[12], "I4"); |
| } |
| *p = '\0'; |
| |
| return p; |
| } |
| |
| static noinline_for_stack |
| char *ip6_string(char *p, const char *addr, const char *fmt) |
| { |
| int i; |
| |
| for (i = 0; i < 8; i++) { |
| p = hex_byte_pack(p, *addr++); |
| p = hex_byte_pack(p, *addr++); |
| if (fmt[0] == 'I' && i != 7) |
| *p++ = ':'; |
| } |
| *p = '\0'; |
| |
| return p; |
| } |
| |
| static noinline_for_stack |
| char *ip6_addr_string(char *buf, char *end, const u8 *addr, |
| struct printf_spec spec, const char *fmt) |
| { |
| char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; |
| |
| if (fmt[0] == 'I' && fmt[2] == 'c') |
| ip6_compressed_string(ip6_addr, addr); |
| else |
| ip6_string(ip6_addr, addr, fmt); |
| |
| return string(buf, end, ip6_addr, spec); |
| } |
| |
| static noinline_for_stack |
| char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
| struct printf_spec spec, const char *fmt) |
| { |
| char ip4_addr[sizeof("255.255.255.255")]; |
| |
| ip4_string(ip4_addr, addr, fmt); |
| |
| return string(buf, end, ip4_addr, spec); |
| } |
| |
| static noinline_for_stack |
| char *uuid_string(char *buf, char *end, const u8 *addr, |
| struct printf_spec spec, const char *fmt) |
| { |
| char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; |
| char *p = uuid; |
| int i; |
| static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; |
| static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; |
| const u8 *index = be; |
| bool uc = false; |
| |
| switch (*(++fmt)) { |
| case 'L': |
| uc = true; /* fall-through */ |
| case 'l': |
| index = le; |
| break; |
| case 'B': |
| uc = true; |
| break; |
| } |
| |
| for (i = 0; i < 16; i++) { |
| p = hex_byte_pack(p, addr[index[i]]); |
| switch (i) { |
| case 3: |
| case 5: |
| case 7: |
| case 9: |
| *p++ = '-'; |
| break; |
| } |
| } |
| |
| *p = 0; |
| |
| if (uc) { |
| p = uuid; |
| do { |
| *p = toupper(*p); |
| } while (*(++p)); |
| } |
| |
| return string(buf, end, uuid, spec); |
| } |
| |
| static |
| char *netdev_feature_string(char *buf, char *end, const u8 *addr, |
| struct printf_spec spec) |
| { |
| spec.flags |= SPECIAL | SMALL | ZEROPAD; |
| if (spec.field_width == -1) |
| spec.field_width = 2 + 2 * sizeof(netdev_features_t); |
| spec.base = 16; |
| |
| return number(buf, end, *(const netdev_features_t *)addr, spec); |
| } |
| |
| int kptr_restrict __read_mostly; |
| |
| /* |
| * Show a '%p' thing. A kernel extension is that the '%p' is followed |
| * by an extra set of alphanumeric characters that are extended format |
| * specifiers. |
| * |
| * Right now we handle: |
| * |
| * - 'F' For symbolic function descriptor pointers with offset |
| * - 'f' For simple symbolic function names without offset |
| * - 'S' For symbolic direct pointers with offset |
| * - 's' For symbolic direct pointers without offset |
| * - 'B' For backtraced symbolic direct pointers with offset |
| * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
| * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] |
| * - 'M' For a 6-byte MAC address, it prints the address in the |
| * usual colon-separated hex notation |
| * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
| * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
| * with a dash-separated hex notation |
| * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
| * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
| * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) |
| * IPv6 uses colon separated network-order 16 bit hex with leading 0's |
| * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
| * IPv6 omits the colons (01020304...0f) |
| * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) |
| * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
| * - 'I6c' for IPv6 addresses printed as specified by |
| * http://tools.ietf.org/html/rfc5952 |
| * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
| * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" |
| * Options for %pU are: |
| * b big endian lower case hex (default) |
| * B big endian UPPER case hex |
| * l little endian lower case hex |
| * L little endian UPPER case hex |
| * big endian output byte order is: |
| * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] |
| * little endian output byte order is: |
| * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] |
| * - 'V' For a struct va_format which contains a format string * and va_list *, |
| * call vsnprintf(->format, *->va_list). |
| * Implements a "recursive vsnprintf". |
| * Do not use this feature without some mechanism to verify the |
| * correctness of the format string and va_list arguments. |
| * - 'K' For a kernel pointer that should be hidden from unprivileged users |
| * - 'NF' For a netdev_features_t |
| * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
| * a certain separator (' ' by default): |
| * C colon |
| * D dash |
| * N no separator |
| * The maximum supported length is 64 bytes of the input. Consider |
| * to use print_hex_dump() for the larger input. |
| * |
| * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
| * function pointers are really function descriptors, which contain a |
| * pointer to the real address. |
| */ |
| static noinline_for_stack |
| char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
| struct printf_spec spec) |
| { |
| int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
| |
| if (!ptr && *fmt != 'K') { |
| /* |
| * Print (null) with the same width as a pointer so it makes |
| * tabular output look nice. |
| */ |
| if (spec.field_width == -1) |
| spec.field_width = default_width; |
| return string(buf, end, "(null)", spec); |
| } |
| |
| switch (*fmt) { |
| case 'F': |
| case 'f': |
| ptr = dereference_function_descriptor(ptr); |
| /* Fallthrough */ |
| case 'S': |
| case 's': |
| case 'B': |
| return symbol_string(buf, end, ptr, spec, *fmt); |
| case 'R': |
| case 'r': |
| return resource_string(buf, end, ptr, spec, fmt); |
| case 'h': |
| return hex_string(buf, end, ptr, spec, fmt); |
| case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
| case 'm': /* Contiguous: 000102030405 */ |
| /* [mM]F (FDDI) */ |
| /* [mM]R (Reverse order; Bluetooth) */ |
| return mac_address_string(buf, end, ptr, spec, fmt); |
| case 'I': /* Formatted IP supported |
| * 4: 1.2.3.4 |
| * 6: 0001:0203:...:0708 |
| * 6c: 1::708 or 1::1.2.3.4 |
| */ |
| case 'i': /* Contiguous: |
| * 4: 001.002.003.004 |
| * 6: 000102...0f |
| */ |
| switch (fmt[1]) { |
| case '6': |
| return ip6_addr_string(buf, end, ptr, spec, fmt); |
| case '4': |
| return ip4_addr_string(buf, end, ptr, spec, fmt); |
| } |
| break; |
| case 'U': |
| return uuid_string(buf, end, ptr, spec, fmt); |
| case 'V': |
| { |
| va_list va; |
| |
| va_copy(va, *((struct va_format *)ptr)->va); |
| buf += vsnprintf(buf, end > buf ? end - buf : 0, |
| ((struct va_format *)ptr)->fmt, va); |
| va_end(va); |
| return buf; |
| } |
| case 'K': |
| /* |
| * %pK cannot be used in IRQ context because its test |
| * for CAP_SYSLOG would be meaningless. |
| */ |
| if (kptr_restrict && (in_irq() || in_serving_softirq() || |
| in_nmi())) { |
| if (spec.field_width == -1) |
| spec.field_width = default_width; |
| return string(buf, end, "pK-error", spec); |
| } |
| if (!((kptr_restrict == 0) || |
| (kptr_restrict == 1 && |
| has_capability_noaudit(current, CAP_SYSLOG)))) |
| ptr = NULL; |
| break; |
| case 'N': |
| switch (fmt[1]) { |
| case 'F': |
| return netdev_feature_string(buf, end, ptr, spec); |
| } |
| break; |
| } |
| spec.flags |= SMALL; |
| if (spec.field_width == -1) { |
| spec.field_width = default_width; |
| spec.flags |= ZEROPAD; |
| } |
| spec.base = 16; |
| |
| return number(buf, end, (unsigned long) ptr, spec); |
| } |
| |
| /* |
| * Helper function to decode printf style format. |
| * Each call decode a token from the format and return the |
| * number of characters read (or likely the delta where it wants |
| * to go on the next call). |
| * The decoded token is returned through the parameters |
| * |
| * 'h', 'l', or 'L' for integer fields |
| * 'z' support added 23/7/1999 S.H. |
| * 'z' changed to 'Z' --davidm 1/25/99 |
| * 't' added for ptrdiff_t |
| * |
| * @fmt: the format string |
| * @type of the token returned |
| * @flags: various flags such as +, -, # tokens.. |
| * @field_width: overwritten width |
| * @base: base of the number (octal, hex, ...) |
| * @precision: precision of a number |
| * @qualifier: qualifier of a number (long, size_t, ...) |
| */ |
| static noinline_for_stack |
| int format_decode(const char *fmt, struct printf_spec *spec) |
| { |
| const char *start = fmt; |
| |
| /* we finished early by reading the field width */ |
| if (spec->type == FORMAT_TYPE_WIDTH) { |
| if (spec->field_width < 0) { |
| spec->field_width = -spec->field_width; |
| spec->flags |= LEFT; |
| } |
| spec->type = FORMAT_TYPE_NONE; |
| goto precision; |
| } |
| |
| /* we finished early by reading the precision */ |
| if (spec->type == FORMAT_TYPE_PRECISION) { |
| if (spec->precision < 0) |
| spec->precision = 0; |
| |
| spec->type = FORMAT_TYPE_NONE; |
| goto qualifier; |
| } |
| |
| /* By default */ |
| spec->type = FORMAT_TYPE_NONE; |
| |
| for (; *fmt ; ++fmt) { |
| if (*fmt == '%') |
| break; |
| } |
| |
| /* Return the current non-format string */ |
| if (fmt != start || !*fmt) |
| return fmt - start; |
| |
| /* Process flags */ |
| spec->flags = 0; |
| |
| while (1) { /* this also skips first '%' */ |
| bool found = true; |
| |
| ++fmt; |
| |
| switch (*fmt) { |
| case '-': spec->flags |= LEFT; break; |
| case '+': spec->flags |= PLUS; break; |
| case ' ': spec->flags |= SPACE; break; |
| case '#': spec->flags |= SPECIAL; break; |
| case '0': spec->flags |= ZEROPAD; break; |
| default: found = false; |
| } |
| |
| if (!found) |
| break; |
| } |
| |
| /* get field width */ |
| spec->field_width = -1; |
| |
| if (isdigit(*fmt)) |
| spec->field_width = skip_atoi(&fmt); |
| else if (*fmt == '*') { |
| /* it's the next argument */ |
| spec->type = FORMAT_TYPE_WIDTH; |
| return ++fmt - start; |
| } |
| |
| precision: |
| /* get the precision */ |
| spec->precision = -1; |
| if (*fmt == '.') { |
| ++fmt; |
| if (isdigit(*fmt)) { |
| spec->precision = skip_atoi(&fmt); |
| if (spec->precision < 0) |
| spec->precision = 0; |
| } else if (*fmt == '*') { |
| /* it's the next argument */ |
| spec->type = FORMAT_TYPE_PRECISION; |
| return ++fmt - start; |
| } |
| } |
| |
| qualifier: |
| /* get the conversion qualifier */ |
| spec->qualifier = -1; |
| if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
| _tolower(*fmt) == 'z' || *fmt == 't') { |
| spec->qualifier = *fmt++; |
| if (unlikely(spec->qualifier == *fmt)) { |
| if (spec->qualifier == 'l') { |
| spec->qualifier = 'L'; |
| ++fmt; |
| } else if (spec->qualifier == 'h') { |
| spec->qualifier = 'H'; |
| ++fmt; |
| } |
| } |
| } |
| |
| /* default base */ |
| spec->base = 10; |
| switch (*fmt) { |
| case 'c': |
| spec->type = FORMAT_TYPE_CHAR; |
| return ++fmt - start; |
| |
| case 's': |
| spec->type = FORMAT_TYPE_STR; |
| return ++fmt - start; |
| |
| case 'p': |
| spec->type = FORMAT_TYPE_PTR; |
| return fmt - start; |
| /* skip alnum */ |
| |
| case 'n': |
| spec->type = FORMAT_TYPE_NRCHARS; |
| return ++fmt - start; |
| |
| case '%': |
| spec->type = FORMAT_TYPE_PERCENT_CHAR; |
| return ++fmt - start; |
| |
| /* integer number formats - set up the flags and "break" */ |
| case 'o': |
| spec->base = 8; |
| break; |
| |
| case 'x': |
| spec->flags |= SMALL; |
| |
| case 'X': |
| spec->base = 16; |
| break; |
| |
| case 'd': |
| case 'i': |
| spec->flags |= SIGN; |
| case 'u': |
| break; |
| |
| default: |
| spec->type = FORMAT_TYPE_INVALID; |
| return fmt - start; |
| } |
| |
| if (spec->qualifier == 'L') |
| spec->type = FORMAT_TYPE_LONG_LONG; |
| else if (spec->qualifier == 'l') { |
| if (spec->flags & SIGN) |
| spec->type = FORMAT_TYPE_LONG; |
| else |
| spec->type = FORMAT_TYPE_ULONG; |
| } else if (_tolower(spec->qualifier) == 'z') { |
| spec->type = FORMAT_TYPE_SIZE_T; |
| } else if (spec->qualifier == 't') { |
| spec->type = FORMAT_TYPE_PTRDIFF; |
| } else if (spec->qualifier == 'H') { |
| if (spec->flags & SIGN) |
| spec->type = FORMAT_TYPE_BYTE; |
| else |
| spec->type = FORMAT_TYPE_UBYTE; |
| } else if (spec->qualifier == 'h') { |
| if (spec->flags & SIGN) |
| spec->type = FORMAT_TYPE_SHORT; |
| else |
| spec->type = FORMAT_TYPE_USHORT; |
| } else { |
| if (spec->flags & SIGN) |
| spec->type = FORMAT_TYPE_INT; |
| else |
| spec->type = FORMAT_TYPE_UINT; |
| } |
| |
| return ++fmt - start; |
| } |
| |
| /** |
| * vsnprintf - Format a string and place it in a buffer |
| * @buf: The buffer to place the result into |
| * @size: The size of the buffer, including the trailing null space |
| * @fmt: The format string to use |
| * @args: Arguments for the format string |
| * |
| * This function follows C99 vsnprintf, but has some extensions: |
| * %pS output the name of a text symbol with offset |
| * %ps output the name of a text symbol without offset |
| * %pF output the name of a function pointer with its offset |
| * %pf output the name of a function pointer without its offset |
| * %pB output the name of a backtrace symbol with its offset |
| * %pR output the address range in a struct resource with decoded flags |
| * %pr output the address range in a struct resource with raw flags |
| * %pM output a 6-byte MAC address with colons |
| * %pMR output a 6-byte MAC address with colons in reversed order |
| * %pMF output a 6-byte MAC address with dashes |
| * %pm output a 6-byte MAC address without colons |
| * %pmR output a 6-byte MAC address without colons in reversed order |
| * %pI4 print an IPv4 address without leading zeros |
| * %pi4 print an IPv4 address with leading zeros |
| * %pI6 print an IPv6 address with colons |
| * %pi6 print an IPv6 address without colons |
| * %pI6c print an IPv6 address as specified by RFC 5952 |
| * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
| * case. |
| * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
| * bytes of the input) |
| * %n is ignored |
| * |
| * ** Please update Documentation/printk-formats.txt when making changes ** |
| * |
| * The return value is the number of characters which would |
| * be generated for the given input, excluding the trailing |
| * '\0', as per ISO C99. If you want to have the exact |
| * number of characters written into @buf as return value |
| * (not including the trailing '\0'), use vscnprintf(). If the |
| * return is greater than or equal to @size, the resulting |
| * string is truncated. |
| * |
| * If you're not already dealing with a va_list consider using snprintf(). |
| */ |
| int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| { |
| unsigned long long num; |
| char *str, *end; |
| struct printf_spec spec = {0}; |
| |
| /* Reject out-of-range values early. Large positive sizes are |
| used for unknown buffer sizes. */ |
| if (WARN_ON_ONCE((int) size < 0)) |
| return 0; |
| |
| str = buf; |
| end = buf + size; |
| |
| /* Make sure end is always >= buf */ |
| if (end < buf) { |
| end = ((void *)-1); |
| size = end - buf; |
| } |
| |
| while (*fmt) { |
| const char *old_fmt = fmt; |
| int read = format_decode(fmt, &spec); |
| |
| fmt += read; |
| |
| switch (spec.type) { |
| case FORMAT_TYPE_NONE: { |
| int copy = read; |
| if (str < end) { |
| if (copy > end - str) |
| copy = end - str; |
| memcpy(str, old_fmt, copy); |
| } |
| str += read; |
| break; |
| } |
| |
| case FORMAT_TYPE_WIDTH: |
| spec.field_width = va_arg(args, int); |
| break; |
| |
| case FORMAT_TYPE_PRECISION: |
| spec.precision = va_arg(args, int); |
| break; |
| |
| case FORMAT_TYPE_CHAR: { |
| char c; |
| |
| if (!(spec.flags & LEFT)) { |
| while (--spec.field_width > 0) { |
| if (str < end) |
| *str = ' '; |
| ++str; |
| |
| } |
| } |
| c = (unsigned char) va_arg(args, int); |
| if (str < end) |
| *str = c; |
| ++str; |
| while (--spec.field_width > 0) { |
| if (str < end) |
| *str = ' '; |
| ++str; |
| } |
| break; |
| } |
| |
| case FORMAT_TYPE_STR: |
| str = string(str, end, va_arg(args, char *), spec); |
| break; |
| |
| case FORMAT_TYPE_PTR: |
| str = pointer(fmt+1, str, end, va_arg(args, void *), |
| spec); |
| while (isalnum(*fmt)) |
| fmt++; |
| break; |
| |
| case FORMAT_TYPE_PERCENT_CHAR: |
| if (str < end) |
| *str = '%'; |
| ++str; |
| break; |
| |
| case FORMAT_TYPE_INVALID: |
| if (str < end) |
| *str = '%'; |
| ++str; |
| break; |
| |
| case FORMAT_TYPE_NRCHARS: { |
| u8 qualifier = spec.qualifier; |
| |
| if (qualifier == 'l') { |
| long *ip = va_arg(args, long *); |
| *ip = (str - buf); |
| } else if (_tolower(qualifier) == 'z') { |
| size_t *ip = va_arg(args, size_t *); |
| *ip = (str - buf); |
| } else { |
| int *ip = va_arg(args, int *); |
| *ip = (str - buf); |
| } |
| break; |
| } |
| |
| default: |
| switch (spec.type) { |
| case FORMAT_TYPE_LONG_LONG: |
| num = va_arg(args, long long); |
| break; |
| case FORMAT_TYPE_ULONG: |
| num = va_arg(args, unsigned long); |
| break; |
| case FORMAT_TYPE_LONG: |
| num = va_arg(args, long); |
| break; |
| case FORMAT_TYPE_SIZE_T: |
| if (spec.flags & SIGN) |
| num = va_arg(args, ssize_t); |
| else |
| num = va_arg(args, size_t); |
| break; |
| case FORMAT_TYPE_PTRDIFF: |
| num = va_arg(args, ptrdiff_t); |
| break; |
| case FORMAT_TYPE_UBYTE: |
| num = (unsigned char) va_arg(args, int); |
| break; |
| case FORMAT_TYPE_BYTE: |
| num = (signed char) va_arg(args, int); |
| break; |
| case FORMAT_TYPE_USHORT: |
| num = (unsigned short) va_arg(args, int); |
| break; |
| case FORMAT_TYPE_SHORT: |
| num = (short) va_arg(args, int); |
| break; |
| case FORMAT_TYPE_INT: |
| num = (int) va_arg(args, int); |
| break; |
| default: |
| num = va_arg(args, unsigned int); |
| } |
| |
| str = number(str, end, num, spec); |
| } |
| } |
| |
| if (size > 0) { |
| if (str < end) |
| *str = '\0'; |
| else |
| end[-1] = '\0'; |
| } |
| |
| /* the trailing null byte doesn't count towards the total */ |
| return str-buf; |
| |
| } |
| EXPORT_SYMBOL(vsnprintf); |
| |
| /** |
| * vscnprintf - Format a string and place it in a buffer |
| * @buf: The buffer to place the result into |
| * @size: The size of the buffer, including the trailing null space |
| * @fmt: The format string to use |
| * @args: Arguments for the format string |
| * |
| * The return value is the number of characters which have been written into |
| * the @buf not including the trailing '\0'. If @size is == 0 the function |
| * returns 0. |
| * |
| * If you're not already dealing with a va_list consider using scnprintf(). |
| * |
| * See the vsnprintf() documentation for format string extensions over C99. |
| */ |
| int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| { |
| int i; |
| |
| i = vsnprintf(buf, size, fmt, args); |
| |
| if (likely(i < size)) |
| return i; |
| if (size != 0) |
| return size - 1; |
| return 0; |
| } |
| EXPORT_SYMBOL(vscnprintf); |
| |
| /** |
| * snprintf - Format a string and place it in a buffer |
| * @buf: The buffer to place the result into |
| * @size: The size of the buffer, including the trailing null space |
| * @fmt: The format string to use |
| * @...: Arguments for the format string |
| * |
| * The return value is the number of characters which would be |
| * generated for the given input, excluding the trailing null, |
| * as per ISO C99. If the return is greater than or equal to |
| * @size, the resulting string is truncated. |
| * |
| * See the vsnprintf() documentation for format string extensions over C99. |
| */ |
| int snprintf(char *buf, size_t size, const char *fmt, ...) |
| { |
| va_list args; |
| int i; |
| |
| va_start(args, fmt); |
| i = vsnprintf(buf, size, fmt, args); |
| va_end(args); |
| |
| return i; |
| } |
| EXPORT_SYMBOL(snprintf); |
| |
| /** |
| * scnprintf - Format a string and place it in a buffer |
| * @buf: The buffer to place the result into |
| * @size: The size of the buffer, including the trailing null space |
| * @fmt: The format string to use |
| * @...: Arguments for the format string |
| * |
| * The return value is the number of characters written into @buf not including |
| * the trailing '\0'. If @size is == 0 the function returns 0. |
| */ |
| |
| int scnprintf(char *buf, size_t size, const char *fmt, ...) |
| { |
| va_list args; |
| int i; |
| |
| va_start(args, fmt); |
| i = vscnprintf(buf, size, fmt, args); |
| va_end(args); |
| |
| return i; |
| } |
| EXPORT_SYMBOL(scnprintf); |
| |
| /** |
| * vsprintf - Format a string and place it in a buffer |
| * @buf: The buffer to place the result into |
| * @fmt: The format string to use |
| * @args: Arguments for the format string |
| * |
| * The function returns the number of characters written |
| * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
| * buffer overflows. |
| * |
| * If you're not already dealing with a va_list consider using sprintf(). |
| * |
| * See the vsnprintf() documentation for format string extensions over C99. |
| */ |
| int vsprintf(char *buf, const char *fmt, va_list args) |
| { |
| return vsnprintf(buf, INT_MAX, fmt, args); |
| } |
| EXPORT_SYMBOL(vsprintf); |
| |
| /** |
| * sprintf - Format a string and place it in a buffer |
| * @buf: The buffer to place the result into |
| * @fmt: The format string to use |
| * @...: Arguments for the format string |
| * |
| * The function returns the number of characters written |
| * into @buf. Use snprintf() or scnprintf() in order to avoid |
| * buffer overflows. |
| * |
| * See the vsnprintf() documentation for format string extensions over C99. |
| */ |
| int sprintf(char *buf, const char *fmt, ...) |
| { |
| va_list args; |
| int i; |
| |
| va_start(args, fmt); |
| i = vsnprintf(buf, INT_MAX, fmt, args); |
| va_end(args); |
| |
| return i; |
| } |
| EXPORT_SYMBOL(sprintf); |
| |
| #ifdef CONFIG_BINARY_PRINTF |
| /* |
| * bprintf service: |
| * vbin_printf() - VA arguments to binary data |
| * bstr_printf() - Binary data to text string |
| */ |
| |
| /** |
| * vbin_printf - Parse a format string and place args' binary value in a buffer |
| * @bin_buf: The buffer to place args' binary value |
| * @size: The size of the buffer(by words(32bits), not characters) |
| * @fmt: The format string to use |
| * @args: Arguments for the format string |
| * |
| * The format follows C99 vsnprintf, except %n is ignored, and its argument |
| * is skiped. |
| * |
| * The return value is the number of words(32bits) which would be generated for |
| * the given input. |
| * |
| * NOTE: |
| * If the return value is greater than @size, the resulting bin_buf is NOT |
| * valid for bstr_printf(). |
| */ |
| int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) |
| { |
| struct printf_spec spec = {0}; |
| char *str, *end; |
| |
| str = (char *)bin_buf; |
| end = (char *)(bin_buf + size); |
| |
| #define save_arg(type) \ |
| do { \ |
| if (sizeof(type) == 8) { \ |
| unsigned long long value; \ |
| str = PTR_ALIGN(str, sizeof(u32)); \ |
| value = va_arg(args, unsigned long long); \ |
| if (str + sizeof(type) <= end) { \ |
| *(u32 *)str = *(u32 *)&value; \ |
| *(u32 *)(str + 4) = *((u32 *)&value + 1); \ |
| } \ |
| } else { \ |
| unsigned long value; \ |
| str = PTR_ALIGN(str, sizeof(type)); \ |
| value = va_arg(args, int); \ |
| if (str + sizeof(type) <= end) \ |
| *(typeof(type) *)str = (type)value; \ |
| } \ |
| str += sizeof(type); \ |
| } while (0) |
| |
| while (*fmt) { |
| int read = format_decode(fmt, &spec); |
| |
| fmt += read; |
| |
| switch (spec.type) { |
| case FORMAT_TYPE_NONE: |
| case FORMAT_TYPE_INVALID: |
| case FORMAT_TYPE_PERCENT_CHAR: |
| break; |
| |
| case FORMAT_TYPE_WIDTH: |
| case FORMAT_TYPE_PRECISION: |
| save_arg(int); |
| break; |
| |
| case FORMAT_TYPE_CHAR: |
| save_arg(char); |
| break; |
| |
| case FORMAT_TYPE_STR: { |
| const char *save_str = va_arg(args, char *); |
| size_t len; |
| |
| if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
| || (unsigned long)save_str < PAGE_SIZE) |
| save_str = "(null)"; |
| len = strlen(save_str) + 1; |
| if (str + len < end) |
| memcpy(str, save_str, len); |
| str += len; |
| break; |
| } |
| |
| case FORMAT_TYPE_PTR: |
| save_arg(void *); |
| /* skip all alphanumeric pointer suffixes */ |
| while (isalnum(*fmt)) |
| fmt++; |
| break; |
| |
| case FORMAT_TYPE_NRCHARS: { |
| /* skip %n 's argument */ |
| u8 qualifier = spec.qualifier; |
| void *skip_arg; |
| if (qualifier == 'l') |
| skip_arg = va_arg(args, long *); |
| else if (_tolower(qualifier) == 'z') |
| skip_arg = va_arg(args, size_t *); |
| else |
| skip_arg = va_arg(args, int *); |
| break; |
| } |
| |
| default: |
| switch (spec.type) { |
| |
| case FORMAT_TYPE_LONG_LONG: |
| save_arg(long long); |
| break; |
| case FORMAT_TYPE_ULONG: |
| case FORMAT_TYPE_LONG: |
| save_arg(unsigned long); |
| break; |
| case FORMAT_TYPE_SIZE_T: |
| save_arg(size_t); |
| break; |
| case FORMAT_TYPE_PTRDIFF: |
| save_arg(ptrdiff_t); |
| break; |
| case FORMAT_TYPE_UBYTE: |
| case FORMAT_TYPE_BYTE: |
| save_arg(char); |
| break; |
| case FORMAT_TYPE_USHORT: |
| case FORMAT_TYPE_SHORT: |
| save_arg(short); |
| break; |
| default: |
| save_arg(int); |
| } |
| } |
| } |
| |
| return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
| #undef save_arg |
| } |
| EXPORT_SYMBOL_GPL(vbin_printf); |
| |
| /** |
| * bstr_printf - Format a string from binary arguments and place it in a buffer |
| * @buf: The buffer to place the result into |
| * @size: The size of the buffer, including the trailing null space |
| * @fmt: The format string to use |
| * @bin_buf: Binary arguments for the format string |
| * |
| * This function like C99 vsnprintf, but the difference is that vsnprintf gets |
| * arguments from stack, and bstr_printf gets arguments from @bin_buf which is |
| * a binary buffer that generated by vbin_printf. |
| * |
| * The format follows C99 vsnprintf, but has some extensions: |
| * see vsnprintf comment for details. |
| * |
| * The return value is the number of characters which would |
| * be generated for the given input, excluding the trailing |
| * '\0', as per ISO C99. If you want to have the exact |
| * number of characters written into @buf as return value |
| * (not including the trailing '\0'), use vscnprintf(). If the |
| * return is greater than or equal to @size, the resulting |
| * string is truncated. |
| */ |
| int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) |
| { |
| struct printf_spec spec = {0}; |
| char *str, *end; |
| const char *args = (const char *)bin_buf; |
| |
| if (WARN_ON_ONCE((int) size < 0)) |
| return 0; |
| |
| str = buf; |
| end = buf + size; |
| |
| #define get_arg(type) \ |
| ({ \ |
| typeof(type) value; \ |
| if (sizeof(type) == 8) { \ |
| args = PTR_ALIGN(args, sizeof(u32)); \ |
| *(u32 *)&value = *(u32 *)args; \ |
| *((u32 *)&value + 1) = *(u32 *)(args + 4); \ |
| } else { \ |
| args = PTR_ALIGN(args, sizeof(type)); \ |
| value = *(typeof(type) *)args; \ |
| } \ |
| args += sizeof(type); \ |
| value; \ |
| }) |
| |
| /* Make sure end is always >= buf */ |
| if (end < buf) { |
| end = ((void *)-1); |
| size = end - buf; |
| } |
| |
| while (*fmt) { |
| const char *old_fmt = fmt; |
| int read = format_decode(fmt, &spec); |
| |
| fmt += read; |
| |
| switch (spec.type) { |
| case FORMAT_TYPE_NONE: { |
| int copy = read; |
| if (str < end) { |
| if (copy > end - str) |
| copy = end - str; |
| memcpy(str, old_fmt, copy); |
| } |
| str += read; |
| break; |
| } |
| |
| case FORMAT_TYPE_WIDTH: |
| spec.field_width = get_arg(int); |
| break; |
| |
| case FORMAT_TYPE_PRECISION: |
| spec.precision = get_arg(int); |
| break; |
| |
| case FORMAT_TYPE_CHAR: { |
| char c; |
| |
| if (!(spec.flags & LEFT)) { |
| while (--spec.field_width > 0) { |
| if (str < end) |
| *str = ' '; |
| ++str; |
| } |
| } |
| c = (unsigned char) get_arg(char); |
| if (str < end) |
| *str = c; |
| ++str; |
| while (--spec.field_width > 0) { |
| if (str < end) |
| *str = ' '; |
| ++str; |
| } |
| break; |
| } |
| |
| case FORMAT_TYPE_STR: { |
| const char *str_arg = args; |
| args += strlen(str_arg) + 1; |
| str = string(str, end, (char *)str_arg, spec); |
| break; |
| } |
| |
| case FORMAT_TYPE_PTR: |
| str = pointer(fmt+1, str, end, get_arg(void *), spec); |
| while (isalnum(*fmt)) |
| fmt++; |
| break; |
| |
| case FORMAT_TYPE_PERCENT_CHAR: |
| case FORMAT_TYPE_INVALID: |
| if (str < end) |
| *str = '%'; |
| ++str; |
| break; |
| |
| case FORMAT_TYPE_NRCHARS: |
| /* skip */ |
| break; |
| |
| default: { |
| unsigned long long num; |
| |
| switch (spec.type) { |
| |
| case FORMAT_TYPE_LONG_LONG: |
| num = get_arg(long long); |
| break; |
| case FORMAT_TYPE_ULONG: |
| case FORMAT_TYPE_LONG: |
| num = get_arg(unsigned long); |
| break; |
| case FORMAT_TYPE_SIZE_T: |
| num = get_arg(size_t); |
| break; |
| case FORMAT_TYPE_PTRDIFF: |
| num = get_arg(ptrdiff_t); |
| break; |
| case FORMAT_TYPE_UBYTE: |
| num = get_arg(unsigned char); |
| break; |
| case FORMAT_TYPE_BYTE: |
| num = get_arg(signed char); |
| break; |
| case FORMAT_TYPE_USHORT: |
| num = get_arg(unsigned short); |
| break; |
| case FORMAT_TYPE_SHORT: |
| num = get_arg(short); |
| break; |
| case FORMAT_TYPE_UINT: |
| num = get_arg(unsigned int); |
| break; |
| default: |
| num = get_arg(int); |
| } |
| |
| str = number(str, end, num, spec); |
| } /* default: */ |
| } /* switch(spec.type) */ |
| } /* while(*fmt) */ |
| |
| if (size > 0) { |
| if (str < end) |
| *str = '\0'; |
| else |
| end[-1] = '\0'; |
| } |
| |
| #undef get_arg |
| |
| /* the trailing null byte doesn't count towards the total */ |
| return str - buf; |
| } |
| EXPORT_SYMBOL_GPL(bstr_printf); |
| |
| /** |
| * bprintf - Parse a format string and place args' binary value in a buffer |
| * @bin_buf: The buffer to place args' binary value |
| * @size: The size of the buffer(by words(32bits), not characters) |
| * @fmt: The format string to use |
| * @...: Arguments for the format string |
| * |
| * The function returns the number of words(u32) written |
| * into @bin_buf. |
| */ |
| int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) |
| { |
| va_list args; |
| int ret; |
| |
| va_start(args, fmt); |
| ret = vbin_printf(bin_buf, size, fmt, args); |
| va_end(args); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(bprintf); |
| |
| #endif /* CONFIG_BINARY_PRINTF */ |
| |
| /** |
| * vsscanf - Unformat a buffer into a list of arguments |
| * @buf: input buffer |
| * @fmt: format of buffer |
| * @args: arguments |
| */ |
| int vsscanf(const char *buf, const char *fmt, va_list args) |
| { |
| const char *str = buf; |
| char *next; |
| char digit; |
| int num = 0; |
| u8 qualifier; |
| u8 base; |
| s16 field_width; |
| bool is_sign; |
| |
| while (*fmt) { |
| /* skip any white space in format */ |
| /* white space in format matchs any amount of |
| * white space, including none, in the input. |
| */ |
| if (isspace(*fmt)) { |
| fmt = skip_spaces(++fmt); |
| str = skip_spaces(str); |
| } |
| |
| /* anything that is not a conversion must match exactly */ |
| if (*fmt != '%' && *fmt) { |
| if (*fmt++ != *str++) |
| break; |
| continue; |
| } |
| |
| if (!*fmt) |
| break; |
| ++fmt; |
| |
| /* skip this conversion. |
| * advance both strings to next white space |
| */ |
| if (*fmt == '*') { |
| if (!*str) |
| break; |
| while (!isspace(*fmt) && *fmt != '%' && *fmt) |
| fmt++; |
| while (!isspace(*str) && *str) |
| str++; |
| continue; |
| } |
| |
| /* get field width */ |
| field_width = -1; |
| if (isdigit(*fmt)) |
| field_width = skip_atoi(&fmt); |
| |
| /* get conversion qualifier */ |
| qualifier = -1; |
| if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
| _tolower(*fmt) == 'z') { |
| qualifier = *fmt++; |
| if (unlikely(qualifier == *fmt)) { |
| if (qualifier == 'h') { |
| qualifier = 'H'; |
| fmt++; |
| } else if (qualifier == 'l') { |
| qualifier = 'L'; |
| fmt++; |
| } |
| } |
| } |
| |
| if (!*fmt) |
| break; |
| |
| if (*fmt == 'n') { |
| /* return number of characters read so far */ |
| *va_arg(args, int *) = str - buf; |
| ++fmt; |
| continue; |
| } |
| |
| if (!*str) |
| break; |
| |
| base = 10; |
| is_sign = 0; |
| |
| switch (*fmt++) { |
| case 'c': |
| { |
| char *s = (char *)va_arg(args, char*); |
| if (field_width == -1) |
| field_width = 1; |
| do { |
| *s++ = *str++; |
| } while (--field_width > 0 && *str); |
| num++; |
| } |
| continue; |
| case 's': |
| { |
| char *s = (char *)va_arg(args, char *); |
| if (field_width == -1) |
| field_width = SHRT_MAX; |
| /* first, skip leading white space in buffer */ |
| str = skip_spaces(str); |
| |
| /* now copy until next white space */ |
| while (*str && !isspace(*str) && field_width--) |
| *s++ = *str++; |
| *s = '\0'; |
| num++; |
| } |
| continue; |
| case 'o': |
| base = 8; |
| break; |
| case 'x': |
| case 'X': |
| base = 16; |
| break; |
| case 'i': |
| base = 0; |
| case 'd': |
| is_sign = 1; |
| case 'u': |
| break; |
| case '%': |
| /* looking for '%' in str */ |
| if (*str++ != '%') |
| return num; |
| continue; |
| default: |
| /* invalid format; stop here */ |
| return num; |
| } |
| |
| /* have some sort of integer conversion. |
| * first, skip white space in buffer. |
| */ |
| str = skip_spaces(str); |
| |
| digit = *str; |
| if (is_sign && digit == '-') |
| digit = *(str + 1); |
| |
| if (!digit |
| || (base == 16 && !isxdigit(digit)) |
| || (base == 10 && !isdigit(digit)) |
| || (base == 8 && (!isdigit(digit) || digit > '7')) |
| || (base == 0 && !isdigit(digit))) |
| break; |
| |
| switch (qualifier) { |
| case 'H': /* that's 'hh' in format */ |
| if (is_sign) { |
| signed char *s = (signed char *)va_arg(args, signed char *); |
| *s = (signed char)simple_strtol(str, &next, base); |
| } else { |
| unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
| *s = (unsigned char)simple_strtoul(str, &next, base); |
| } |
| break; |
| case 'h': |
| if (is_sign) { |
| short *s = (short *)va_arg(args, short *); |
| *s = (short)simple_strtol(str, &next, base); |
| } else { |
| unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
| *s = (unsigned short)simple_strtoul(str, &next, base); |
| } |
| break; |
| case 'l': |
| if (is_sign) { |
| long *l = (long *)va_arg(args, long *); |
| *l = simple_strtol(str, &next, base); |
| } else { |
| unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
| *l = simple_strtoul(str, &next, base); |
| } |
| break; |
| case 'L': |
| if (is_sign) { |
| long long *l = (long long *)va_arg(args, long long *); |
| *l = simple_strtoll(str, &next, base); |
| } else { |
| unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
| *l = simple_strtoull(str, &next, base); |
| } |
| break; |
| case 'Z': |
| case 'z': |
| { |
| size_t *s = (size_t *)va_arg(args, size_t *); |
| *s = (size_t)simple_strtoul(str, &next, base); |
| } |
| break; |
| default: |
| if (is_sign) { |
| int *i = (int *)va_arg(args, int *); |
| *i = (int)simple_strtol(str, &next, base); |
| } else { |
| unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
| *i = (unsigned int)simple_strtoul(str, &next, base); |
| } |
| break; |
| } |
| num++; |
| |
| if (!next) |
| break; |
| str = next; |
| } |
| |
| return num; |
| } |
| EXPORT_SYMBOL(vsscanf); |
| |
| /** |
| * sscanf - Unformat a buffer into a list of arguments |
| * @buf: input buffer |
| * @fmt: formatting of buffer |
| * @...: resulting arguments |
| */ |
| int sscanf(const char *buf, const char *fmt, ...) |
| { |
| va_list args; |
| int i; |
| |
| va_start(args, fmt); |
| i = vsscanf(buf, fmt, args); |
| va_end(args); |
| |
| return i; |
| } |
| EXPORT_SYMBOL(sscanf); |