Lucas De Marchi | 4462c4a | 2011-11-29 18:05:43 -0200 | [diff] [blame] | 1 | /* |
| 2 | * libkmod - interface to kernel module operations |
| 3 | * |
| 4 | * Copyright (C) 2011 ProFUSION embedded systems |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
Lucas De Marchi | cb451f3 | 2011-12-12 18:24:35 -0200 | [diff] [blame] | 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
Lucas De Marchi | 4462c4a | 2011-11-29 18:05:43 -0200 | [diff] [blame] | 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
Lucas De Marchi | 7e317da | 2011-11-30 19:20:19 -0200 | [diff] [blame] | 21 | #include <assert.h> |
Lucas De Marchi | 4462c4a | 2011-11-29 18:05:43 -0200 | [diff] [blame] | 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <stddef.h> |
| 25 | #include <stdarg.h> |
| 26 | #include <unistd.h> |
| 27 | #include <errno.h> |
| 28 | #include <string.h> |
| 29 | #include <ctype.h> |
| 30 | |
| 31 | #include "libkmod.h" |
| 32 | #include "libkmod-private.h" |
| 33 | |
| 34 | /* |
| 35 | * Read one logical line from a configuration file. |
| 36 | * |
| 37 | * Line endings may be escaped with backslashes, to form one logical line from |
| 38 | * several physical lines. No end of line character(s) are included in the |
| 39 | * result. |
| 40 | * |
| 41 | * If linenum is not NULL, it is incremented by the number of physical lines |
| 42 | * which have been read. |
| 43 | */ |
| 44 | char *getline_wrapped(FILE *fp, unsigned int *linenum) |
| 45 | { |
| 46 | int size = 256; |
| 47 | int i = 0; |
| 48 | char *buf = malloc(size); |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 49 | |
Lucas De Marchi | 4462c4a | 2011-11-29 18:05:43 -0200 | [diff] [blame] | 50 | for(;;) { |
| 51 | int ch = getc_unlocked(fp); |
| 52 | |
| 53 | switch(ch) { |
| 54 | case EOF: |
| 55 | if (i == 0) { |
| 56 | free(buf); |
| 57 | return NULL; |
| 58 | } |
| 59 | /* else fall through */ |
| 60 | |
| 61 | case '\n': |
| 62 | if (linenum) |
| 63 | (*linenum)++; |
| 64 | if (i == size) |
| 65 | buf = realloc(buf, size + 1); |
| 66 | buf[i] = '\0'; |
| 67 | return buf; |
| 68 | |
| 69 | case '\\': |
| 70 | ch = getc_unlocked(fp); |
| 71 | |
| 72 | if (ch == '\n') { |
| 73 | if (linenum) |
| 74 | (*linenum)++; |
| 75 | continue; |
| 76 | } |
| 77 | /* else fall through */ |
| 78 | |
| 79 | default: |
| 80 | buf[i++] = ch; |
| 81 | |
| 82 | if (i == size) { |
| 83 | size *= 2; |
| 84 | buf = realloc(buf, size); |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | } |
Lucas De Marchi | 8185fc9 | 2011-11-30 02:14:33 -0200 | [diff] [blame] | 89 | |
| 90 | /* |
| 91 | * Replace dashes with underscores. |
| 92 | * Dashes inside character range patterns (e.g. [0-9]) are left unchanged. |
| 93 | */ |
| 94 | char *underscores(struct kmod_ctx *ctx, char *s) |
| 95 | { |
| 96 | unsigned int i; |
| 97 | |
| 98 | if (!s) |
| 99 | return NULL; |
| 100 | |
| 101 | for (i = 0; s[i]; i++) { |
| 102 | switch (s[i]) { |
| 103 | case '-': |
| 104 | s[i] = '_'; |
| 105 | break; |
| 106 | |
| 107 | case ']': |
| 108 | INFO(ctx, "Unmatched bracket in %s\n", s); |
| 109 | break; |
| 110 | |
| 111 | case '[': |
| 112 | i += strcspn(&s[i], "]"); |
| 113 | if (!s[i]) |
| 114 | INFO(ctx, "Unmatched bracket in %s\n", s); |
| 115 | break; |
| 116 | } |
| 117 | } |
| 118 | return s; |
| 119 | } |
| 120 | |
Lucas De Marchi | b148b86 | 2011-12-13 10:24:22 -0200 | [diff] [blame^] | 121 | inline int alias_normalize(const char *alias, char buf[NAME_MAX], size_t *len) |
| 122 | { |
| 123 | size_t s; |
| 124 | |
| 125 | for (s = 0; s < NAME_MAX - 1; s++) { |
| 126 | const char c = alias[s]; |
| 127 | switch (c) { |
| 128 | case '-': |
| 129 | buf[s] = '_'; |
| 130 | break; |
| 131 | case ']': |
| 132 | return -EINVAL; |
| 133 | case '[': |
| 134 | while (alias[s] != ']' && |
| 135 | alias[s] != '.' && alias[s] != '\0') |
| 136 | s++; |
| 137 | |
| 138 | if (alias[s] != ']') |
| 139 | return -EINVAL; |
| 140 | |
| 141 | s++; |
| 142 | break; |
| 143 | case '\0': |
| 144 | case '.': |
| 145 | goto finish; |
| 146 | default: |
| 147 | buf[s] = c; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | finish: |
| 152 | buf[s] = '\0'; |
| 153 | |
| 154 | if (len) |
| 155 | *len = s; |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
Lucas De Marchi | 7e317da | 2011-11-30 19:20:19 -0200 | [diff] [blame] | 160 | bool startswith(const char *s, const char *prefix) { |
| 161 | size_t sl, pl; |
| 162 | |
| 163 | assert(s); |
| 164 | assert(prefix); |
| 165 | |
| 166 | sl = strlen(s); |
| 167 | pl = strlen(prefix); |
| 168 | |
| 169 | if (pl == 0) |
| 170 | return true; |
| 171 | |
| 172 | if (sl < pl) |
| 173 | return false; |
| 174 | |
| 175 | return memcmp(s, prefix, pl) == 0; |
| 176 | } |
Lucas De Marchi | e22c85f | 2011-12-02 17:21:18 -0200 | [diff] [blame] | 177 | |
| 178 | inline void *memdup(const void *p, size_t n) |
| 179 | { |
| 180 | void *r = malloc(n); |
| 181 | |
| 182 | if (r == NULL) |
| 183 | return NULL; |
| 184 | |
| 185 | return memcpy(r, p, n); |
| 186 | } |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 187 | |
| 188 | ssize_t read_str_safe(int fd, char *buf, size_t buflen) { |
| 189 | size_t todo = buflen; |
| 190 | size_t done; |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 191 | |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 192 | do { |
| 193 | ssize_t r = read(fd, buf, todo); |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 194 | |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 195 | if (r == 0) |
| 196 | break; |
| 197 | else if (r > 0) |
| 198 | todo -= r; |
| 199 | else { |
| 200 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
| 201 | errno == EINTR) |
| 202 | continue; |
| 203 | else |
| 204 | return -errno; |
| 205 | } |
| 206 | } while (todo > 0); |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 207 | |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 208 | done = buflen - todo; |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 209 | |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 210 | if (done == 0) |
| 211 | buf[0] = '\0'; |
| 212 | else { |
| 213 | if (done < buflen) |
| 214 | buf[done] = '\0'; |
| 215 | else if (buf[done - 1] != '\0') |
| 216 | return -ENOSPC; |
| 217 | } |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 218 | |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 219 | return done; |
| 220 | } |
| 221 | |
| 222 | int read_str_long(int fd, long *value, int base) { |
| 223 | char buf[32], *end; |
| 224 | long v; |
| 225 | int err; |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 226 | |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 227 | *value = 0; |
| 228 | err = read_str_safe(fd, buf, sizeof(buf)); |
| 229 | if (err < 0) |
| 230 | return err; |
| 231 | errno = 0; |
| 232 | v = strtol(buf, &end, base); |
| 233 | if (end == buf || !isspace(*end)) |
| 234 | return -EINVAL; |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 235 | |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 236 | *value = v; |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | int read_str_ulong(int fd, unsigned long *value, int base) { |
| 241 | char buf[32], *end; |
| 242 | long v; |
| 243 | int err; |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 244 | |
Gustavo Sverzut Barbieri | f12ae3c | 2011-12-04 12:40:00 -0200 | [diff] [blame] | 245 | *value = 0; |
| 246 | err = read_str_safe(fd, buf, sizeof(buf)); |
| 247 | if (err < 0) |
| 248 | return err; |
| 249 | errno = 0; |
| 250 | v = strtoul(buf, &end, base); |
| 251 | if (end == buf || !isspace(*end)) |
| 252 | return -EINVAL; |
| 253 | *value = v; |
| 254 | return 0; |
| 255 | } |
Lucas De Marchi | afca780 | 2011-12-07 10:59:17 -0200 | [diff] [blame] | 256 | |
| 257 | char *strchr_replace(char *s, int c, char r) |
| 258 | { |
| 259 | char *p; |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 260 | |
Gustavo Sverzut Barbieri | bf8cf14 | 2011-12-10 19:45:37 -0200 | [diff] [blame] | 261 | for (p = s; *p != '\0'; p++) |
| 262 | if (*p == c) |
| 263 | *p = r; |
Lucas De Marchi | 28c175e | 2011-12-12 11:52:59 -0200 | [diff] [blame] | 264 | |
Lucas De Marchi | afca780 | 2011-12-07 10:59:17 -0200 | [diff] [blame] | 265 | return s; |
| 266 | } |
Lucas De Marchi | 3a46880 | 2011-12-07 13:50:52 -0200 | [diff] [blame] | 267 | |
| 268 | bool path_is_absolute(const char *p) |
| 269 | { |
| 270 | assert(p != NULL); |
| 271 | |
| 272 | return p[0] == '/'; |
| 273 | } |
Lucas De Marchi | 06363cc | 2011-12-07 13:51:40 -0200 | [diff] [blame] | 274 | |
| 275 | char *path_make_absolute_cwd(const char *p) |
| 276 | { |
| 277 | char *cwd, *r; |
| 278 | size_t plen; |
| 279 | size_t cwdlen; |
| 280 | |
| 281 | if (path_is_absolute(p)) |
| 282 | return strdup(p); |
| 283 | |
| 284 | cwd = get_current_dir_name(); |
| 285 | if (cwd == NULL) |
| 286 | return NULL; |
| 287 | |
| 288 | plen = strlen(p); |
| 289 | cwdlen = strlen(cwd); |
| 290 | |
| 291 | /* cwd + '/' + p + '\0' */ |
| 292 | r = realloc(cwd, cwdlen + 1 + plen + 1); |
| 293 | if (r == NULL) { |
| 294 | free(cwd); |
| 295 | return NULL; |
| 296 | } |
| 297 | |
Lucas De Marchi | 4eb2c0f | 2011-12-08 10:37:56 -0200 | [diff] [blame] | 298 | r[cwdlen] = '/'; |
| 299 | memcpy(&r[cwdlen + 1], p, plen + 1); |
Lucas De Marchi | 06363cc | 2011-12-07 13:51:40 -0200 | [diff] [blame] | 300 | |
| 301 | return r; |
| 302 | } |