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annotate lib/getndelim2.c @ 8582:88177595d847

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Tweak last patch: Sync with gettext.
author Bruno Haible <bruno@clisp.org>
date Thu, 29 Mar 2007 22:34:33 +0000
parents 84cd79e074c1
children bbbbbf4cd1c5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4463
7564fca8961e New module 'getndelim2'.
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1 /* getndelim2 - Read a line from a stream, stopping at one of 2 delimiters,
7564fca8961e New module 'getndelim2'.
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2 with bounded memory allocation.
4460
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3
7162
19c2e5121b2f Add and change modules to make it easier for coreutils to use
Paul Eggert <eggert@cs.ucla.edu>
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4 Copyright (C) 1993, 1996, 1997, 1998, 2000, 2003, 2004, 2006 Free
19c2e5121b2f Add and change modules to make it easier for coreutils to use
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5 Software Foundation, Inc.
4460
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6
1892b6732a40 New module 'getnline'.
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7 This program is free software; you can redistribute it and/or modify
1892b6732a40 New module 'getnline'.
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diff changeset
8 it under the terms of the GNU General Public License as published by
1892b6732a40 New module 'getnline'.
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9 the Free Software Foundation; either version 2, or (at your option)
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10 any later version.
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11
1892b6732a40 New module 'getnline'.
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
1892b6732a40 New module 'getnline'.
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1892b6732a40 New module 'getnline'.
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15 GNU General Public License for more details.
1892b6732a40 New module 'getnline'.
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16
1892b6732a40 New module 'getnline'.
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17 You should have received a copy of the GNU General Public License
1892b6732a40 New module 'getnline'.
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18 along with this program; if not, write to the Free Software Foundation,
5848
a48fb0e98c8c *** empty log message ***
Paul Eggert <eggert@cs.ucla.edu>
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19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
4460
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20
4463
7564fca8961e New module 'getndelim2'.
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21 /* Originally written by Jan Brittenson, bson@gnu.ai.mit.edu. */
7564fca8961e New module 'getndelim2'.
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22
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23 #include <config.h>
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7564fca8961e New module 'getndelim2'.
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24
7564fca8961e New module 'getndelim2'.
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25 #include "getndelim2.h"
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26
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27 #include <stdlib.h>
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d39dc0b72f5b * getndelim2.c: Include stddef.h, for ptrdiff_t.
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28 #include <stddef.h>
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29
5318
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30 #if USE_UNLOCKED_IO
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31 # include "unlocked-io.h"
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32 #endif
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33
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aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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34 #include <limits.h>
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35 #include <stdint.h>
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36
7538
a75213853379 Make getndelim2 compile on mingw.
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37 #ifndef SSIZE_MAX
7539
84cd79e074c1 * lib/getndelim2.c (SSIZE_MAX): Use same defn that getdelim.c
Paul Eggert <eggert@cs.ucla.edu>
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38 # define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
7538
a75213853379 Make getndelim2 compile on mingw.
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39 #endif
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40
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41 /* The maximum value that getndelim2 can return without suffering from
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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42 overflow problems, either internally (because of pointer
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parents: 5049
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43 subtraction overflow) or due to the API (because of ssize_t). */
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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44 #define GETNDELIM2_MAXIMUM (PTRDIFF_MAX < SSIZE_MAX ? PTRDIFF_MAX : SSIZE_MAX)
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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45
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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46 /* Try to add at least this many bytes when extending the buffer.
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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parents: 5049
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47 MIN_CHUNK must be no greater than GETNDELIM2_MAXIMUM. */
4460
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48 #define MIN_CHUNK 64
1892b6732a40 New module 'getnline'.
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49
4463
7564fca8961e New module 'getndelim2'.
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50 ssize_t
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aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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51 getndelim2 (char **lineptr, size_t *linesize, size_t offset, size_t nmax,
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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52 int delim1, int delim2, FILE *stream)
4460
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53 {
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54 size_t nbytes_avail; /* Allocated but unused bytes in *LINEPTR. */
4460
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55 char *read_pos; /* Where we're reading into *LINEPTR. */
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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56 ssize_t bytes_stored = -1;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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57 char *ptr = *lineptr;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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58 size_t size = *linesize;
4460
1892b6732a40 New module 'getnline'.
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59
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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60 if (!ptr)
4460
1892b6732a40 New module 'getnline'.
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61 {
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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62 size = nmax < MIN_CHUNK ? nmax : MIN_CHUNK;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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63 ptr = malloc (size);
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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64 if (!ptr)
4460
1892b6732a40 New module 'getnline'.
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65 return -1;
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66 }
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67
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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68 if (size < offset)
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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parents: 5049
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69 goto done;
4460
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70
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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parents: 5049
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71 nbytes_avail = size - offset;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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72 read_pos = ptr + offset;
4460
1892b6732a40 New module 'getnline'.
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73
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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74 if (nbytes_avail == 0 && nmax <= size)
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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75 goto done;
4460
1892b6732a40 New module 'getnline'.
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parents:
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76
1892b6732a40 New module 'getnline'.
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77 for (;;)
1892b6732a40 New module 'getnline'.
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78 {
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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79 /* Here always ptr + size == read_pos + nbytes_avail. */
4460
1892b6732a40 New module 'getnline'.
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80
5062
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81 int c;
4460
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82
5062
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Paul Eggert <eggert@cs.ucla.edu>
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83 /* We always want at least one byte left in the buffer, since we
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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84 always (unless we get an error while reading the first byte)
4460
1892b6732a40 New module 'getnline'.
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85 NUL-terminate the line buffer. */
1892b6732a40 New module 'getnline'.
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diff changeset
86
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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87 if (nbytes_avail < 2 && size < nmax)
4460
1892b6732a40 New module 'getnline'.
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parents:
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88 {
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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89 size_t newsize = size < MIN_CHUNK ? size + MIN_CHUNK : 2 * size;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
diff changeset
90 char *newptr;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
91
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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92 if (! (size < newsize && newsize <= nmax))
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
diff changeset
93 newsize = nmax;
4460
1892b6732a40 New module 'getnline'.
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94
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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95 if (GETNDELIM2_MAXIMUM < newsize - offset)
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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96 {
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97 size_t newsizemax = offset + GETNDELIM2_MAXIMUM + 1;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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98 if (size == newsizemax)
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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99 goto done;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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100 newsize = newsizemax;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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parents: 5049
diff changeset
101 }
4460
1892b6732a40 New module 'getnline'.
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parents:
diff changeset
102
5062
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103 nbytes_avail = newsize - (read_pos - ptr);
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104 newptr = realloc (ptr, newsize);
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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105 if (!newptr)
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106 goto done;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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107 ptr = newptr;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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108 size = newsize;
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109 read_pos = size - nbytes_avail + ptr;
4460
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110 }
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111
4711
37bbd4e80866 Don't trash errno when a read fails.
Paul Eggert <eggert@cs.ucla.edu>
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112 c = getc (stream);
37bbd4e80866 Don't trash errno when a read fails.
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113 if (c == EOF)
4460
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114 {
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115 /* Return partial line, if any. */
5062
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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116 if (read_pos == ptr)
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
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parents: 5049
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117 goto done;
4460
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118 else
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119 break;
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120 }
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parents:
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121
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122 if (nbytes_avail >= 2)
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123 {
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124 *read_pos++ = c;
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125 nbytes_avail--;
1892b6732a40 New module 'getnline'.
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126 }
1892b6732a40 New module 'getnline'.
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parents:
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127
5062
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parents: 5049
diff changeset
128 if (c == delim1 || c == delim2)
4460
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129 /* Return the line. */
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130 break;
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parents:
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131 }
1892b6732a40 New module 'getnline'.
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132
5062
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133 /* Done - NUL terminate and return the number of bytes read.
4460
1892b6732a40 New module 'getnline'.
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parents:
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134 At this point we know that nbytes_avail >= 1. */
1892b6732a40 New module 'getnline'.
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135 *read_pos = '\0';
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parents:
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136
5062
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Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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137 bytes_stored = read_pos - (ptr + offset);
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parents: 5049
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138
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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139 done:
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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140 *lineptr = ptr;
aa119e787246 getline cleanup. This changes the getndelim2 API: both order of arguments,
Paul Eggert <eggert@cs.ucla.edu>
parents: 5049
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141 *linesize = size;
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parents: 5049
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142 return bytes_stored;
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parents:
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143 }