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

   1 /*
   2  * fgetline.c: implementation of fgetline.h.
   3  */
   4
   5 #include <stdio.h>
   6 #include <string.h>
   7
   8 #include "malloc.h"
   9 #include "fgetline.h"
  10
  11 char *fgetline(FILE *fp)
  12 {
  13     char *ret = snewn(512, char);
  14     int size = 512, len = 0;
  15     while (fgets(ret + len, size - len, fp)) {
  16         len += strlen(ret + len);
  17         if (ret[len-1] == '\n')
  18             break;                     /* got a newline, we're done */
  19         size = len + 512;
  20         ret = sresize(ret, size, char);
  21     }
  22     if (len == 0) {                    /* first fgets returned NULL */
  23         sfree(ret);
  24         return NULL;
  25     }
  26     ret[len] = '\0';
  27     return ret;
  28 }