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Annotation of mandoc/compat_getline.c, Revision 1.2

1.2     ! schwarze    1: /* $Id: compat_getline.c,v 1.1 2015/11/07 20:52:52 schwarze Exp $ */
1.1       schwarze    2: /*
                      3:  * Copyright (c) 2015 Ingo Schwarze <schwarze@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:  */
1.2     ! schwarze   17: #include "config.h"
1.1       schwarze   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: }

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