CEP/C/misc.c

   1 #include <stdio.h>
   2 #include <stdarg.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <assert.h>
   6
   7 #include "misc.h"
   8
   9 void fatal(const char *err, ...)
  10 {
  11         va_list params;
  12
  13         fputs("ERROR: ", stderr);
  14
  15         va_start(params, err);
  16         vfprintf(stderr, err, params);
  17         va_end(params);
  18
  19         putc('\n', stderr);
  20
  21         exit(1);
  22 }
  23
  24 char *read_chars(FILE *db, int (*eof_chars)(FILE *db, char c))
  25 {
  26         int c;
  27         char *info;
  28         size_t len, i;
  29         const int def_len = 12;
  30         const int grow_hate = 2;
  31
  32         len = def_len;
  33
  34         info = malloc(len);
  35         if (!info)
  36                 fatal("Could not allocate memory");
  37
  38         i = 0;
  39         for (;;) {
  40                 for (; i < len; i++) {
  41                         c = fgetc(db);
  42                         if (c == EOF) {
  43                                 free(info);
  44                                 return NULL;
  45                         } else if (eof_chars(db, c)) {
  46                                 info[i] = '\0';
  47                                 return info;
  48                         }
  49
  50                         /*
  51                          * we probably don't want these characters
  52                          * in the buffer
  53                          */
  54                         assert(c != '\0');
  55                         assert(c != '\r');
  56                         assert(c != '\n');
  57
  58                         info[i] = c;
  59                 }
  60
  61                 len *= grow_hate;
  62                 info = realloc(info, len);
  63                 if (!info)
  64                         fatal("Could not reallocate memory");
  65         }
  66
  67         /* should never get here */
  68         abort();
  69
  70         return NULL; /* gcc */
  71 }