| /* -*- linux-c -*- ------------------------------------------------------- * |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * Copyright 2007 rPath, Inc. - All Rights Reserved |
| * |
| * This file is part of the Linux kernel, and is made available under |
| * the terms of the GNU General Public License version 2. |
| * |
| * ----------------------------------------------------------------------- */ |
| |
| /* |
| * Very basic string functions |
| */ |
| |
| #include "boot.h" |
| |
| int strcmp(const char *str1, const char *str2) |
| { |
| const unsigned char *s1 = (const unsigned char *)str1; |
| const unsigned char *s2 = (const unsigned char *)str2; |
| int delta = 0; |
| |
| while (*s1 || *s2) { |
| delta = *s2 - *s1; |
| if (delta) |
| return delta; |
| s1++; |
| s2++; |
| } |
| return 0; |
| } |
| |
| int strncmp(const char *cs, const char *ct, size_t count) |
| { |
| unsigned char c1, c2; |
| |
| while (count) { |
| c1 = *cs++; |
| c2 = *ct++; |
| if (c1 != c2) |
| return c1 < c2 ? -1 : 1; |
| if (!c1) |
| break; |
| count--; |
| } |
| return 0; |
| } |
| |
| size_t strnlen(const char *s, size_t maxlen) |
| { |
| const char *es = s; |
| while (*es && maxlen) { |
| es++; |
| maxlen--; |
| } |
| |
| return (es - s); |
| } |
| |
| unsigned int atou(const char *s) |
| { |
| unsigned int i = 0; |
| while (isdigit(*s)) |
| i = i * 10 + (*s++ - '0'); |
| return i; |
| } |
| |
| /* Works only for digits and letters, but small and fast */ |
| #define TOLOWER(x) ((x) | 0x20) |
| |
| unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
| { |
| unsigned long long result = 0; |
| |
| if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
| cp += 2; |
| |
| while (isxdigit(*cp)) { |
| unsigned int value; |
| |
| value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; |
| if (value >= base) |
| break; |
| result = result * base + value; |
| cp++; |
| } |
| if (endp) |
| *endp = (char *)cp; |
| |
| return result; |
| } |