Home | History | Annotate | Line # | Download | only in compat
fgetln.c revision 1.10 
      1 /*	$NetBSD: fgetln.c,v 1.10 2015/10/08 20:20:45 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2015 Joerg Jung <jung (at) openbsd.org>
      5  *
      6  * Permission to use, copy, modify, and distribute this software for any
      7  * purpose with or without fee is hereby granted, provided that the above
      8  * copyright notice and this permission notice appear in all copies.
      9  *
     10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     17  */
     18 
     19 /*
     20  * portable fgetln() version, reentrant
     21  */
     22 
     23 #ifdef HAVE_NBTOOL_CONFIG_H
     24 #include "nbtool_config.h"
     25 #endif
     26 
     27 #if !HAVE_FGETLN
     28 #include <stdlib.h>
     29 #ifndef HAVE_NBTOOL_CONFIG_H
     30 /* These headers are required, but included from nbtool_config.h */
     31 #include <stdio.h>
     32 #include <stdlib.h>
     33 #include <errno.h>
     34 #endif
     35 
     36 char *
     37 fgetln(FILE *fp, size_t *len)
     38 {
     39 	static char *buf = NULL;
     40 	static size_t bufsz = 0;
     41 	size_t r = 0;
     42 	char *p;
     43 	int c, e;
     44 
     45 	if (!fp || !len) {
     46 		errno = EINVAL;
     47 		return NULL;
     48 	}
     49 	if (!buf) {
     50 		if (!(buf = calloc(1, BUFSIZ)))
     51 			return NULL;
     52 		bufsz = BUFSIZ;
     53 	}
     54 	while ((c = getc(fp)) != EOF) {
     55 		buf[r++] = c;
     56 		if (r == bufsz) {
     57 			// Original uses reallocarray() but we don't have it
     58 			// in tools.
     59 			if (!(p = realloc(buf, 2 * bufsz))) {
     60 				e = errno;
     61 				free(buf);
     62 				errno = e;
     63 				buf = NULL, bufsz = 0;
     64 				return NULL;
     65 			}
     66 			buf = p, bufsz = 2 * bufsz;
     67 		}
     68 		if (c == '\n')
     69 			break;
     70 	}
     71 	return (*len = r) ? buf : NULL;
     72 }
     73 #endif
     74 
     75 
     76 #ifdef TEST
     77 int
     78 main(int argc, char *argv[])
     79 {
     80 	char *p;
     81 	size_t len;
     82 
     83 	while ((p = fgetln(stdin, &len)) != NULL) {
     84 		(void)printf("%zu %s", len, p);
     85 		free(p);
     86 	}
     87 	return 0;
     88 }
     89 #endif
     90