82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
#include "stdio_impl.h"
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#include <string.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <errno.h>
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ssize_t getdelim(char **restrict s, size_t *restrict n, int delim, FILE *restrict f)
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{
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char *tmp;
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unsigned char *z;
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size_t k;
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size_t i=0;
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int c;
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FLOCK(f);
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if (!n || !s) {
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f->mode |= f->mode-1;
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f->flags |= F_ERR;
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FUNLOCK(f);
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errno = EINVAL;
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return -1;
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}
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if (!*s) *n=0;
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for (;;) {
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if (f->rpos != f->rend) {
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z = memchr(f->rpos, delim, f->rend - f->rpos);
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k = z ? z - f->rpos + 1 : f->rend - f->rpos;
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} else {
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z = 0;
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k = 0;
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}
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if (i+k >= *n) {
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size_t m = i+k+2;
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if (!z && m < SIZE_MAX/4) m += m/2;
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tmp = realloc(*s, m);
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if (!tmp) {
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m = i+k+2;
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tmp = realloc(*s, m);
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if (!tmp) {
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/* Copy as much as fits and ensure no
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* pushback remains in the FILE buf. */
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k = *n-i;
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memcpy(*s+i, f->rpos, k);
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f->rpos += k;
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f->mode |= f->mode-1;
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f->flags |= F_ERR;
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FUNLOCK(f);
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errno = ENOMEM;
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return -1;
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}
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}
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*s = tmp;
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*n = m;
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}
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memcpy(*s+i, f->rpos, k);
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f->rpos += k;
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i += k;
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if (z) break;
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if ((c = getc_unlocked(f)) == EOF) {
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if (!i || !feof(f)) {
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FUNLOCK(f);
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return -1;
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}
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break;
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}
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/* If the byte read by getc won't fit without growing the
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* output buffer, push it back for next iteration. */
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if (i+1 >= *n) *--f->rpos = c;
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else if (((*s)[i++] = c) == delim) break;
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}
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(*s)[i] = 0;
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FUNLOCK(f);
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return i;
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}
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weak_alias(getdelim, __getdelim);
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