Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/linebuffer.c @ 4663:f3ad8f03546c
Include <stdlib.h>.
(free): Remove decl.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 09 Sep 2003 21:51:00 +0000 |
| parents | 4d31b2ff9bab |
| children | c3e2b42bdca3 |
| rev | line source |
|---|---|
| 14 | 1 /* linebuffer.c -- read arbitrarily long lines |
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2 |
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3 Copyright (C) 1986, 1991, 1998, 1999, 2001, 2003 Free Software |
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4 Foundation, Inc. |
| 14 | 5 |
| 6 This program is free software; you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 2, or (at your option) | |
| 9 any later version. | |
| 10 | |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 1464 | 17 along with this program; if not, write to the Free Software Foundation, |
| 18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
| 14 | 19 |
| 20 /* Written by Richard Stallman. */ | |
| 21 | |
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22 #ifdef HAVE_CONFIG_H |
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23 # include <config.h> |
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24 #endif |
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25 |
| 14 | 26 #include <stdio.h> |
| 4663 | 27 #include <stdlib.h> |
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28 #include <sys/types.h> |
| 14 | 29 #include "linebuffer.h" |
| 3618 | 30 #include "unlocked-io.h" |
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31 #include "xalloc.h" |
| 14 | 32 |
| 33 /* Initialize linebuffer LINEBUFFER for use. */ | |
| 34 | |
| 35 void | |
| 1465 | 36 initbuffer (struct linebuffer *linebuffer) |
| 14 | 37 { |
| 38 linebuffer->length = 0; | |
| 39 linebuffer->size = 200; | |
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40 linebuffer->buffer = xmalloc (linebuffer->size); |
| 14 | 41 } |
| 42 | |
| 43 /* Read an arbitrarily long line of text from STREAM into LINEBUFFER. | |
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44 Keep the newline; append a newline if it's the last line of a file |
|
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45 that ends in a non-newline character. Do not null terminate. |
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parents:
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46 Therefore the stream can contain NUL bytes, and the length |
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47 (including the newline) is returned in linebuffer->length. |
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48 Return NULL upon error, or when STREAM is empty. |
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parents:
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49 Otherwise, return LINEBUFFER. */ |
| 14 | 50 struct linebuffer * |
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parents:
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51 readlinebuffer (struct linebuffer *linebuffer, FILE *stream) |
| 14 | 52 { |
| 53 int c; | |
| 54 char *buffer = linebuffer->buffer; | |
| 55 char *p = linebuffer->buffer; | |
|
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56 char *end = buffer + linebuffer->size; /* Sentinel. */ |
| 14 | 57 |
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58 if (feof (stream) || ferror (stream)) |
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parents:
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59 return NULL; |
| 14 | 60 |
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61 do |
| 14 | 62 { |
| 63 c = getc (stream); | |
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64 if (c == EOF) |
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65 { |
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parents:
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66 if (p == buffer) |
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72b3b19fece2
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Jim Meyering <jim@meyering.net>
parents:
3618
diff
changeset
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67 return NULL; |
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parents:
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68 if (p[-1] == '\n') |
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parents:
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69 break; |
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(readline): Append trailing newline to line.
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parents:
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70 c = '\n'; |
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parents:
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71 } |
| 14 | 72 if (p == end) |
| 73 { | |
| 74 linebuffer->size *= 2; | |
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3678
72b3b19fece2
Remove explicit declarations of xmalloc and xrealloc,
Jim Meyering <jim@meyering.net>
parents:
3618
diff
changeset
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75 buffer = xrealloc (buffer, linebuffer->size); |
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ac8a74ce72cd
(readline): Append trailing newline to line.
Jim Meyering <jim@meyering.net>
parents:
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diff
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76 p = p - linebuffer->buffer + buffer; |
| 14 | 77 linebuffer->buffer = buffer; |
|
1991
e7ed29061994
(readline): Do not leave room for an extra
Jim Meyering <jim@meyering.net>
parents:
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diff
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78 end = buffer + linebuffer->size; |
| 14 | 79 } |
| 80 *p++ = c; | |
| 81 } | |
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ac8a74ce72cd
(readline): Append trailing newline to line.
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parents:
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82 while (c != '\n'); |
| 14 | 83 |
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ac8a74ce72cd
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parents:
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84 linebuffer->length = p - buffer; |
| 14 | 85 return linebuffer; |
| 86 } | |
| 87 | |
| 88 /* Free linebuffer LINEBUFFER and its data, all allocated with malloc. */ | |
| 89 | |
| 90 void | |
| 1465 | 91 freebuffer (struct linebuffer *linebuffer) |
| 14 | 92 { |
| 93 free (linebuffer->buffer); | |
| 94 free (linebuffer); | |
| 95 } |