commands/pax/fgetln.c

   1
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 char *
   7 fgetln(FILE *fp, size_t *lenp)
   8 {
   9 #define EXTRA 80
  10         char *buf = NULL;
  11         int used = 0, len = 0, remain = 0, final = 0;
  12         while(!final) {
  13                 char *b;
  14                 int r;
  15                 if(remain < EXTRA) {
  16                         int newlen;
  17                         char *newbuf;
  18                         newlen = len + EXTRA;
  19                         if(!(newbuf = realloc(buf, newlen))) {
  20                                 if(buf) free(buf);
  21                                 return NULL;
  22                         }
  23                         buf = newbuf;
  24                         len = newlen;
  25                         remain += EXTRA;
  26                 }
  27                 buf[used] = '\0';
  28                 if(!fgets(buf + used, remain, fp))
  29                         break;
  30                 r = strlen(buf+used);
  31                 used += r;
  32                 remain -= r;
  33                 len += r;
  34         }
  35         *lenp = len;
  36         return buf;
  37 }
  38