mdw@git.distorted.org.uk Git - sgt/agedu/blob - fgetline.c

   1 /*
   2  * fgetline.c: implementation of fgetline.h.
   3  */
   4
   5 #include "agedu.h"
   6 #include "alloc.h"
   7 #include "fgetline.h"
   8
   9 char *fgetline(FILE *fp)
  10 {
  11     char *ret = snewn(512, char);
  12     int size = 512, len = 0;
  13     while (fgets(ret + len, size - len, fp)) {
  14         len += strlen(ret + len);
  15         if (ret[len-1] == '\n')
  16             break;                     /* got a newline, we're done */
  17         size = len + 512;
  18         ret = sresize(ret, size, char);
  19     }
  20     if (len == 0) {                    /* first fgets returned NULL */
  21         sfree(ret);
  22         return NULL;
  23     }
  24     ret[len] = '\0';
  25     return ret;
  26 }