[15496] | 1 | /* Copyright (C) 1991, 1992, 1995, 1996, 1997 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Library General Public License as |
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| 6 | published by the Free Software Foundation; either version 2 of the |
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| 7 | License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Library General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Library General Public |
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| 15 | License along with the GNU C Library; see the file COPYING.LIB. If not, |
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| 16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 17 | Boston, MA 02111-1307, USA. */ |
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| 18 | |
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| 19 | #include <stddef.h> |
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| 20 | #include <stdio.h> |
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| 21 | #include <stdlib.h> |
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| 22 | #include <string.h> |
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| 23 | #include <limits.h> |
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| 24 | #include <errno.h> |
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| 25 | |
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| 26 | /* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR |
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| 27 | (and null-terminate it). *LINEPTR is a pointer returned from malloc (or |
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| 28 | NULL), pointing to *N characters of space. It is realloc'd as |
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| 29 | necessary. Returns the number of characters read (not including the |
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| 30 | null terminator), or -1 on error or EOF. */ |
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| 31 | |
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| 32 | ssize_t |
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| 33 | getdelim (lineptr, n, terminator, stream) |
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| 34 | char **lineptr; |
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| 35 | size_t *n; |
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| 36 | int terminator; |
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| 37 | FILE *stream; |
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| 38 | { |
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| 39 | char *line, *p; |
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| 40 | size_t size, copy; |
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| 41 | |
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| 42 | if (!__validfp (stream) || lineptr == NULL || n == NULL) |
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| 43 | { |
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| 44 | __set_errno (EINVAL); |
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| 45 | return -1; |
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| 46 | } |
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| 47 | |
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| 48 | if (ferror (stream)) |
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| 49 | return -1; |
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| 50 | |
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| 51 | /* Make sure we have a line buffer to start with. */ |
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| 52 | if (*lineptr == NULL || *n < 2) /* !seen and no buf yet need 2 chars. */ |
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| 53 | { |
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| 54 | #ifndef MAX_CANON |
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| 55 | #define MAX_CANON 256 |
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| 56 | #endif |
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| 57 | line = realloc (*lineptr, MAX_CANON); |
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| 58 | if (line == NULL) |
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| 59 | return -1; |
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| 60 | *lineptr = line; |
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| 61 | *n = MAX_CANON; |
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| 62 | } |
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| 63 | |
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| 64 | line = *lineptr; |
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| 65 | size = *n; |
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| 66 | |
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| 67 | copy = size; |
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| 68 | p = line; |
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| 69 | |
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| 70 | if (stream->__buffer == NULL && stream->__userbuf) |
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| 71 | { |
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| 72 | /* Unbuffered stream. Not much optimization to do. */ |
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| 73 | |
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| 74 | while (1) |
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| 75 | { |
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| 76 | size_t len; |
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| 77 | |
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| 78 | while (--copy > 0) |
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| 79 | { |
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| 80 | register int c = getc (stream); |
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| 81 | if (c == EOF) |
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| 82 | goto lose; |
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| 83 | else if ((*p++ = c) == terminator) |
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| 84 | goto win; |
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| 85 | } |
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| 86 | |
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| 87 | /* Need to enlarge the line buffer. */ |
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| 88 | len = p - line; |
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| 89 | size *= 2; |
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| 90 | line = realloc (line, size); |
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| 91 | if (line == NULL) |
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| 92 | goto lose; |
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| 93 | *lineptr = line; |
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| 94 | *n = size; |
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| 95 | p = line + len; |
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| 96 | copy = size - len; |
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| 97 | } |
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| 98 | } |
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| 99 | else |
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| 100 | { |
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| 101 | /* Leave space for the terminating null. */ |
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| 102 | --copy; |
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| 103 | |
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| 104 | if (!stream->__seen || stream->__buffer == NULL || stream->__pushed_back) |
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| 105 | { |
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| 106 | /* Do one with getc to allocate a buffer. */ |
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| 107 | int c = getc (stream); |
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| 108 | if (c == EOF) |
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| 109 | goto lose; |
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| 110 | *p++ = c; |
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| 111 | if (c == terminator) |
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| 112 | goto win; |
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| 113 | --copy; |
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| 114 | } |
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| 115 | |
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| 116 | while (1) |
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| 117 | { |
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| 118 | size_t i; |
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| 119 | char *found; |
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| 120 | |
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| 121 | i = stream->__get_limit - stream->__bufp; |
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| 122 | if (i == 0) |
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| 123 | { |
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| 124 | /* Refill the buffer. */ |
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| 125 | int c = __fillbf (stream); |
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| 126 | if (c == EOF) |
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| 127 | goto lose; |
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| 128 | *p++ = c; |
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| 129 | if (c == terminator) |
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| 130 | goto win; |
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| 131 | --copy; |
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| 132 | i = stream->__get_limit - stream->__bufp; |
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| 133 | } |
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| 134 | |
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| 135 | if (i > copy) |
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| 136 | i = copy; |
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| 137 | |
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| 138 | found = (char *) __memccpy ((void *) p, stream->__bufp, |
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| 139 | terminator, i); |
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| 140 | if (found != NULL) |
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| 141 | { |
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| 142 | stream->__bufp += found - p; |
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| 143 | p = found; |
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| 144 | goto win; |
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| 145 | } |
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| 146 | |
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| 147 | stream->__bufp += i; |
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| 148 | p += i; |
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| 149 | copy -= i; |
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| 150 | if (copy == 0) |
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| 151 | { |
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| 152 | /* Need to enlarge the line buffer. */ |
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| 153 | size_t len = p - line; |
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| 154 | size *= 2; |
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| 155 | line = realloc (line, size); |
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| 156 | if (line == NULL) |
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| 157 | goto lose; |
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| 158 | *lineptr = line; |
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| 159 | *n = size; |
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| 160 | p = line + len; |
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| 161 | copy = size - len; |
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| 162 | /* Leave space for the terminating null. */ |
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| 163 | --copy; |
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| 164 | } |
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| 165 | } |
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| 166 | } |
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| 167 | |
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| 168 | lose: |
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| 169 | if (p == *lineptr) |
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| 170 | return -1; |
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| 171 | /* Return a partial line since we got an error in the middle. */ |
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| 172 | win: |
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| 173 | *p = '\0'; |
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| 174 | return p - *lineptr; |
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| 175 | } |
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| 176 | |
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| 177 | weak_alias (__getdelim, getdelim) |
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