nsz Git - musl/blob - src/stdio/getdelim.c

   1 #include "stdio_impl.h"
   2
   3 #define MIN(a,b) ((a)<(b) ? (a) : (b))
   4
   5 ssize_t getdelim(char **s, size_t *n, int delim, FILE *f)
   6 {
   7         char *tmp;
   8         unsigned char *z;
   9         size_t k;
  10         size_t i=0;
  11
  12         if (!n || !s) {
  13                 errno = EINVAL;
  14                 return -1;
  15         }
  16
  17         if (!*s) *n=0;
  18
  19         FLOCK(f);
  20
  21         while (!feof(f)) {
  22                 z = memchr(f->rpos, delim, f->rend - f->rpos);
  23                 k = z ? z - f->rpos + 1 : f->rend - f->rpos;
  24                 if (i+k >= *n) {
  25                         if (k >= SIZE_MAX-i) goto oom;
  26                         *n = i+k+1;
  27                         if (*n < SIZE_MAX/2) *n *= 2;
  28                         tmp = realloc(*s, *n);
  29                         if (!tmp) {
  30                                 *n = i+k+1;
  31                                 tmp = realloc(*s, *n);
  32                                 if (!tmp) goto oom;
  33                         }
  34                         *s = tmp;
  35                 }
  36                 memcpy(*s+i, f->rpos, k);
  37                 f->rpos += k;
  38                 i += k;
  39                 if (z) break;
  40                 __underflow(f);
  41         }
  42         (*s)[i] = 0;
  43         if (feof(f) || ferror(f)) {
  44                 FUNLOCK(f);
  45                 return -1;
  46         }
  47
  48         FUNLOCK(f);
  49
  50         if (i > SSIZE_MAX) {
  51                 errno = EOVERFLOW;
  52                 return -1;
  53         }
  54
  55         return i;
  56 oom:
  57         errno = ENOMEM;
  58         return -1;
  59 }