Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 1 | /* |
| 2 | * This file contains helper functions for labeling support. |
| 3 | * |
| 4 | * Author : Richard Haines <richard_c_haines@btinternet.com> |
| 5 | */ |
| 6 | |
| 7 | #include <stdlib.h> |
| 8 | #include <stdarg.h> |
| 9 | #include <ctype.h> |
| 10 | #include <string.h> |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 11 | #include <errno.h> |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 12 | #include "label_internal.h" |
| 13 | |
| 14 | /* |
| 15 | * The read_spec_entries and read_spec_entry functions may be used to |
| 16 | * replace sscanf to read entries from spec files. The file and |
| 17 | * property services now use these. |
| 18 | */ |
| 19 | |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 20 | /* |
| 21 | * Read an entry from a spec file (e.g. file_contexts) |
| 22 | * entry - Buffer to allocate for the entry. |
| 23 | * ptr - current location of the line to be processed. |
| 24 | * returns - 0 on success and *entry is set to be a null |
| 25 | * terminated value. On Error it returns -1 and |
| 26 | errno will be set. |
| 27 | * |
| 28 | */ |
| 29 | static inline int read_spec_entry(char **entry, char **ptr, int *len, const char **errbuf) |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 30 | { |
| 31 | *entry = NULL; |
| 32 | char *tmp_buf = NULL; |
| 33 | |
| 34 | while (isspace(**ptr) && **ptr != '\0') |
| 35 | (*ptr)++; |
| 36 | |
| 37 | tmp_buf = *ptr; |
| 38 | *len = 0; |
| 39 | |
| 40 | while (!isspace(**ptr) && **ptr != '\0') { |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 41 | if (!isascii(**ptr)) { |
| 42 | errno = EINVAL; |
| 43 | *errbuf = "Non-ASCII characters found"; |
| 44 | return -1; |
| 45 | } |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 46 | (*ptr)++; |
| 47 | (*len)++; |
| 48 | } |
| 49 | |
| 50 | if (*len) { |
| 51 | *entry = strndup(tmp_buf, *len); |
| 52 | if (!*entry) |
| 53 | return -1; |
| 54 | } |
| 55 | |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * line_buf - Buffer containing the spec entries . |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 61 | * errbuf - Double pointer used for passing back specific error messages. |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 62 | * num_args - The number of spec parameter entries to process. |
| 63 | * ... - A 'char **spec_entry' for each parameter. |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 64 | * returns - The number of items processed. On error, it returns -1 with errno |
| 65 | * set and may set errbuf to a specific error message. |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 66 | * |
| 67 | * This function calls read_spec_entry() to do the actual string processing. |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 68 | * As such, can return anything from that function as well. |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 69 | */ |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 70 | int hidden read_spec_entries(char *line_buf, const char **errbuf, int num_args, ...) |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 71 | { |
| 72 | char **spec_entry, *buf_p; |
| 73 | int len, rc, items, entry_len = 0; |
| 74 | va_list ap; |
| 75 | |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 76 | *errbuf = NULL; |
| 77 | |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 78 | len = strlen(line_buf); |
| 79 | if (line_buf[len - 1] == '\n') |
| 80 | line_buf[len - 1] = '\0'; |
| 81 | else |
| 82 | /* Handle case if line not \n terminated by bumping |
| 83 | * the len for the check below (as the line is NUL |
| 84 | * terminated by getline(3)) */ |
| 85 | len++; |
| 86 | |
| 87 | buf_p = line_buf; |
| 88 | while (isspace(*buf_p)) |
| 89 | buf_p++; |
| 90 | |
| 91 | /* Skip comment lines and empty lines. */ |
| 92 | if (*buf_p == '#' || *buf_p == '\0') |
| 93 | return 0; |
| 94 | |
| 95 | /* Process the spec file entries */ |
| 96 | va_start(ap, num_args); |
| 97 | |
| 98 | items = 0; |
| 99 | while (items < num_args) { |
| 100 | spec_entry = va_arg(ap, char **); |
| 101 | |
| 102 | if (len - 1 == buf_p - line_buf) { |
| 103 | va_end(ap); |
| 104 | return items; |
| 105 | } |
| 106 | |
William Roberts | 640db2f | 2016-02-02 13:46:55 -0800 | [diff] [blame] | 107 | rc = read_spec_entry(spec_entry, &buf_p, &entry_len, errbuf); |
Richard Haines | 6d0b91b | 2015-06-04 20:03:41 +0100 | [diff] [blame] | 108 | if (rc < 0) { |
| 109 | va_end(ap); |
| 110 | return rc; |
| 111 | } |
| 112 | if (entry_len) |
| 113 | items++; |
| 114 | } |
| 115 | va_end(ap); |
| 116 | return items; |
| 117 | } |