udev-acl/resolve-modalias.c

   1 #include <stdio.h>
   2 #include <fnmatch.h>
   3 #include <string.h>
   4 #include <malloc.h>
   5
   6 static char *my_getline(FILE *file) {
   7   static size_t size = 1024;
   8   static char *buf = NULL;
   9   static unsigned int i = 0, r = 0;;
  10
  11   if(buf == NULL)
  12     buf = (char*)malloc(size);
  13
  14   if(i) {
  15     memmove(buf, buf+i, size-i);
  16     r -= i;
  17     i = 0;
  18   }
  19
  20   while(1) {
  21     if(i == size) {
  22       size *= 2;
  23       buf = (char*)realloc(buf, size);
  24     }
  25
  26     if(i==r)
  27       r += fread(buf+i, 1, size-i, file);
  28
  29     if(i==r && i == 0) {
  30       free(buf);
  31       buf = NULL;
  32       r = 0;
  33       return NULL;
  34     }
  35
  36     if(i==r || buf[i] == '\n') {
  37       buf[i++] = '\0';
  38       return buf;
  39     }
  40     i++;
  41   }
  42 }
  43
  44 int main(int argc, char *argv[]) {
  45   char *line, *pattern, *module;
  46   char *pos1, *pos2;
  47
  48   if(argc != 3) {
  49       fprintf(stderr, "usage: resolve-modalias <alias file> <modalias>\n");
  50       return 1;
  51   }
  52
  53   FILE *f=fopen(argv[1], "r");
  54   if(!f) {
  55     perror("error opening alias file");
  56     return 1;
  57   }
  58
  59   while((line=my_getline(f))!=NULL) {
  60     if(!strncmp(line, "alias", strlen("alias"))) {
  61       pos1 = index(line, ' ');
  62       pos2 = index(pos1+1, ' ');
  63       pattern = pos1+1;
  64       *pos2 = '\0';
  65       module = pos2+1;
  66
  67       if(!fnmatch(pattern, argv[2], 0))
  68         printf("%s\n", module);
  69     }
  70   }
  71   return 0;
  72 }
  73 //vim: set ts=2 sw=2 et: