Mercurial > hg > octave-lojdl > gnulib-hg
annotate lib/linebuffer.c @ 3689:27e5e0915016
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| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Wed, 19 Dec 2001 15:05:38 +0000 |
| parents | 72b3b19fece2 |
| children | 4d31b2ff9bab |
| rev | line source |
|---|---|
| 14 | 1 /* linebuffer.c -- read arbitrarily long lines |
| 3618 | 2 Copyright (C) 1986, 1991, 1998, 1999, 2001 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 | |
| 1464 | 15 along with this program; if not, write to the Free Software Foundation, |
| 16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
| 14 | 17 |
| 18 /* Written by Richard Stallman. */ | |
| 19 | |
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20 #ifdef HAVE_CONFIG_H |
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21 # include <config.h> |
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22 #endif |
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23 |
| 14 | 24 #include <stdio.h> |
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25 #include <sys/types.h> |
| 14 | 26 #include "linebuffer.h" |
| 3618 | 27 #include "unlocked-io.h" |
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28 #include "xalloc.h" |
| 14 | 29 |
| 30 void free (); | |
| 31 | |
| 32 /* Initialize linebuffer LINEBUFFER for use. */ | |
| 33 | |
| 34 void | |
| 1465 | 35 initbuffer (struct linebuffer *linebuffer) |
| 14 | 36 { |
| 37 linebuffer->length = 0; | |
| 38 linebuffer->size = 200; | |
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39 linebuffer->buffer = xmalloc (linebuffer->size); |
| 14 | 40 } |
| 41 | |
| 42 /* Read an arbitrarily long line of text from STREAM into LINEBUFFER. | |
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43 Keep the newline; append a newline if it's the last line of a file |
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44 that ends in a non-newline character. Do not null terminate. |
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45 Therefore the stream can contain NUL bytes, and the length |
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46 (including the newline) is returned in linebuffer->length. |
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47 Return NULL upon error, or when STREAM is empty. |
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48 Otherwise, return LINEBUFFER. */ |
| 14 | 49 struct linebuffer * |
| 1465 | 50 readline (struct linebuffer *linebuffer, FILE *stream) |
| 14 | 51 { |
| 52 int c; | |
| 53 char *buffer = linebuffer->buffer; | |
| 54 char *p = linebuffer->buffer; | |
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55 char *end = buffer + linebuffer->size; /* Sentinel. */ |
| 14 | 56 |
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57 if (feof (stream) || ferror (stream)) |
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58 return NULL; |
| 14 | 59 |
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60 do |
| 14 | 61 { |
| 62 c = getc (stream); | |
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63 if (c == EOF) |
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64 { |
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65 if (p == buffer) |
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66 return NULL; |
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67 if (p[-1] == '\n') |
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68 break; |
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69 c = '\n'; |
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70 } |
| 14 | 71 if (p == end) |
| 72 { | |
| 73 linebuffer->size *= 2; | |
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74 buffer = xrealloc (buffer, linebuffer->size); |
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75 p = p - linebuffer->buffer + buffer; |
| 14 | 76 linebuffer->buffer = buffer; |
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77 end = buffer + linebuffer->size; |
| 14 | 78 } |
| 79 *p++ = c; | |
| 80 } | |
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81 while (c != '\n'); |
| 14 | 82 |
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83 linebuffer->length = p - buffer; |
| 14 | 84 return linebuffer; |
| 85 } | |
| 86 | |
| 87 /* Free linebuffer LINEBUFFER and its data, all allocated with malloc. */ | |
| 88 | |
| 89 void | |
| 1465 | 90 freebuffer (struct linebuffer *linebuffer) |
| 14 | 91 { |
| 92 free (linebuffer->buffer); | |
| 93 free (linebuffer); | |
| 94 } |