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      1 /* Id: compat_getline.c,v 1.2 2020/06/15 01:37:14 schwarze Exp  */
      2 /*
      3  * Copyright (c) 2015 Ingo Schwarze <schwarze (at) openbsd.org>
      4  *
      5  * Permission to use, copy, modify, and distribute this software for any
      6  * purpose with or without fee is hereby granted, provided that the above
      7  * copyright notice and this permission notice appear in all copies.
      8  *
      9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     16  */
     17 #include "config.h"
     18 
     19 #include <sys/types.h>
     20 #include <errno.h>
     21 #include <stdio.h>
     22 #include <stdlib.h>
     23 
     24 ssize_t
     25 getline(char **buf, size_t *bufsz, FILE *fp)
     26 {
     27 	char	*nbuf;
     28 	size_t	 nbufsz, pos;
     29 	int	 c;
     30 
     31 	if (buf == NULL || bufsz == NULL) {
     32 		errno = EINVAL;
     33 		return -1;
     34 	}
     35 
     36 	if (*buf == NULL)
     37 		*bufsz = 0;
     38 	else
     39 		**buf = '\0';
     40 
     41 	pos = 0;
     42 	for (;;) {
     43 		if (pos + 1 >= *bufsz) {
     44 			nbufsz = *bufsz ? *bufsz * 2 : BUFSIZ;
     45 			if ((nbuf = realloc(*buf, nbufsz)) == NULL)
     46 				return -1;
     47 			*buf = nbuf;
     48 			*bufsz = nbufsz;
     49 		}
     50 		if ((c = fgetc(fp)) == EOF) {
     51 			(*buf)[pos] = '\0';
     52 			return pos > 0 && feof(fp) ? (ssize_t)pos : -1;
     53 		}
     54 		(*buf)[pos++] = c;
     55 		(*buf)[pos] = '\0';
     56 		if (c == '\n')
     57 			return pos;
     58 	}
     59 }
     60