1 /* $NetBSD: fgetln.c,v 1.12 2015/10/09 14:42:40 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2015 Joerg Jung <jung@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 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 /* 58 * Original uses reallocarray() but we don't have it 59 * in tools. 60 */ 61 if (!(p = realloc(buf, 2 * bufsz))) { 62 e = errno; 63 free(buf); 64 errno = e; 65 buf = NULL, bufsz = 0; 66 return NULL; 67 } 68 buf = p, bufsz = 2 * bufsz; 69 } 70 if (c == '\n') 71 break; 72 } 73 return (*len = r) ? buf : NULL; 74 } 75 #endif 76 77 78 #ifdef TEST 79 int 80 main(int argc, char *argv[]) 81 { 82 char *p; 83 size_t len; 84 85 while ((p = fgetln(stdin, &len)) != NULL) { 86 (void)printf("%zu %s", len, p); 87 free(p); 88 } 89 return 0; 90 } 91 #endif 92