Mercurial > hg > octave-lojdl > gnulib-hg
annotate lib/linebuffer.c @ 1463:f8f00a1e2989
(readline): Return zero upon error as well as upon
end of file. From James Youngman.
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Mon, 03 Aug 1998 03:02:04 +0000 |
| parents | 3eda3e12f7ba |
| children | b15c026c2dbd |
| rev | line source |
|---|---|
| 14 | 1 /* linebuffer.c -- read arbitrarily long lines |
|
1463
f8f00a1e2989
(readline): Return zero upon error as well as upon
Jim Meyering <jim@meyering.net>
parents:
14
diff
changeset
|
2 Copyright (C) 1986, 1991, 1998 Free Software Foundation, Inc. |
| 14 | 3 |
| 4 This program is free software; you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 2, or (at your option) | |
| 7 any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 15 along with this program; if not, write to the Free Software | |
|
1463
f8f00a1e2989
(readline): Return zero upon error as well as upon
Jim Meyering <jim@meyering.net>
parents:
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diff
changeset
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16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 14 | 17 |
| 18 /* Written by Richard Stallman. */ | |
| 19 | |
|
1463
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(readline): Return zero upon error as well as upon
Jim Meyering <jim@meyering.net>
parents:
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diff
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20 #ifdef HAVE_CONFIG_H |
|
f8f00a1e2989
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parents:
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21 # include <config.h> |
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parents:
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22 #endif |
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f8f00a1e2989
(readline): Return zero upon error as well as upon
Jim Meyering <jim@meyering.net>
parents:
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23 |
| 14 | 24 #include <stdio.h> |
| 25 #include "linebuffer.h" | |
| 26 | |
| 27 char *xmalloc (); | |
| 28 char *xrealloc (); | |
| 29 void free (); | |
| 30 | |
| 31 /* Initialize linebuffer LINEBUFFER for use. */ | |
| 32 | |
| 33 void | |
| 34 initbuffer (linebuffer) | |
| 35 struct linebuffer *linebuffer; | |
| 36 { | |
| 37 linebuffer->length = 0; | |
| 38 linebuffer->size = 200; | |
| 39 linebuffer->buffer = (char *) xmalloc (linebuffer->size); | |
| 40 } | |
| 41 | |
| 42 /* Read an arbitrarily long line of text from STREAM into LINEBUFFER. | |
| 43 Remove any newline. Does not null terminate. | |
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1463
f8f00a1e2989
(readline): Return zero upon error as well as upon
Jim Meyering <jim@meyering.net>
parents:
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diff
changeset
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44 Return zero upon error or upon end of file. |
|
f8f00a1e2989
(readline): Return zero upon error as well as upon
Jim Meyering <jim@meyering.net>
parents:
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changeset
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45 Otherwise, return LINEBUFFER. */ |
| 14 | 46 |
| 47 struct linebuffer * | |
| 48 readline (linebuffer, stream) | |
| 49 struct linebuffer *linebuffer; | |
| 50 FILE *stream; | |
| 51 { | |
| 52 int c; | |
| 53 char *buffer = linebuffer->buffer; | |
| 54 char *p = linebuffer->buffer; | |
| 55 char *end = buffer + linebuffer->size; /* Sentinel. */ | |
| 56 | |
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1463
f8f00a1e2989
(readline): Return zero upon error as well as upon
Jim Meyering <jim@meyering.net>
parents:
14
diff
changeset
|
57 if (feof (stream) || ferror (stream)) |
| 14 | 58 { |
| 59 linebuffer->length = 0; | |
| 60 return 0; | |
| 61 } | |
| 62 | |
| 63 while (1) | |
| 64 { | |
| 65 c = getc (stream); | |
| 66 if (p == end) | |
| 67 { | |
| 68 linebuffer->size *= 2; | |
| 69 buffer = (char *) xrealloc (buffer, linebuffer->size); | |
| 70 p += buffer - linebuffer->buffer; | |
| 71 linebuffer->buffer = buffer; | |
| 72 end = buffer + linebuffer->size; | |
| 73 } | |
| 74 if (c == EOF || c == '\n') | |
| 75 break; | |
| 76 *p++ = c; | |
| 77 } | |
| 78 | |
| 79 if (feof (stream) && p == buffer) | |
| 80 { | |
| 81 linebuffer->length = 0; | |
| 82 return 0; | |
| 83 } | |
| 84 linebuffer->length = p - linebuffer->buffer; | |
| 85 return linebuffer; | |
| 86 } | |
| 87 | |
| 88 /* Free linebuffer LINEBUFFER and its data, all allocated with malloc. */ | |
| 89 | |
| 90 void | |
| 91 freebuffer (linebuffer) | |
| 92 struct linebuffer *linebuffer; | |
| 93 { | |
| 94 free (linebuffer->buffer); | |
| 95 free (linebuffer); | |
| 96 } |