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Annotation of embedaddon/tmux/compat/fgetln.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 2015 Joerg Jung <jung@openbsd.org>
                      3:  *
                      4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     15:  */
                     16: 
                     17: /*
                     18:  * portable fgetln() version, NOT reentrant
                     19:  */
                     20: 
                     21: #include <stdio.h>
                     22: #include <stdlib.h>
                     23: #include <errno.h>
                     24: 
                     25: #include "compat.h"
                     26: 
                     27: char *
                     28: fgetln(FILE *fp, size_t *len)
                     29: {
                     30:        static char *buf = NULL;
                     31:        static size_t bufsz = 0;
                     32:        size_t r = 0;
                     33:        char *p;
                     34:        int c, e;
                     35: 
                     36:        if (!fp || !len) {
                     37:                errno = EINVAL;
                     38:                return NULL;
                     39:        }
                     40:        if (!buf) {
                     41:                if (!(buf = calloc(1, BUFSIZ)))
                     42:                        return NULL;
                     43:                bufsz = BUFSIZ;
                     44:        }
                     45:        while ((c = getc(fp)) != EOF) {
                     46:                buf[r++] = c;
                     47:                if (r == bufsz) {
                     48:                        if (!(p = reallocarray(buf, 2, bufsz))) {
                     49:                                e = errno;
                     50:                                free(buf);
                     51:                                errno = e;
                     52:                                buf = NULL, bufsz = 0;
                     53:                                return NULL;
                     54:                        }
                     55:                        buf = p, bufsz = 2 * bufsz;
                     56:                }
                     57:                if (c == '\n')
                     58:                        break;
                     59:        }
                     60:        return (*len = r) ? buf : NULL;
                     61: }