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annotate lib/linebuffer.c @ 2807:807294ed0f4f
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| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Mon, 07 Aug 2000 15:48:18 +0000 |
| parents | 5994c6f939c5 |
| children | 72422d1e9181 |
| rev | line source |
|---|---|
| 14 | 1 /* linebuffer.c -- read arbitrarily long lines |
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2 Copyright (C) 1986, 1991, 1998, 1999 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" |
| 27 | |
| 28 char *xmalloc (); | |
| 29 char *xrealloc (); | |
| 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; | |
| 39 linebuffer->buffer = (char *) xmalloc (linebuffer->size); | |
| 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 Return LINEBUFFER, except at end of file return 0. */ |
| 14 | 46 |
| 47 struct linebuffer * | |
| 1465 | 48 readline (struct linebuffer *linebuffer, FILE *stream) |
| 14 | 49 { |
| 50 int c; | |
| 51 char *buffer = linebuffer->buffer; | |
| 52 char *p = linebuffer->buffer; | |
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53 char *end = buffer + linebuffer->size; /* Sentinel. */ |
| 14 | 54 |
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55 if (feof (stream) || ferror (stream)) |
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56 return 0; |
| 14 | 57 |
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58 do |
| 14 | 59 { |
| 60 c = getc (stream); | |
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61 if (c == EOF) |
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62 { |
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63 if (p == buffer) |
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64 return 0; |
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65 if (p[-1] == '\n') |
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66 break; |
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67 c = '\n'; |
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68 } |
| 14 | 69 if (p == end) |
| 70 { | |
| 71 linebuffer->size *= 2; | |
| 72 buffer = (char *) xrealloc (buffer, linebuffer->size); | |
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73 p = p - linebuffer->buffer + buffer; |
| 14 | 74 linebuffer->buffer = buffer; |
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75 end = buffer + linebuffer->size; |
| 14 | 76 } |
| 77 *p++ = c; | |
| 78 } | |
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79 while (c != '\n'); |
| 14 | 80 |
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81 linebuffer->length = p - buffer; |
| 14 | 82 return linebuffer; |
| 83 } | |
| 84 | |
| 85 /* Free linebuffer LINEBUFFER and its data, all allocated with malloc. */ | |
| 86 | |
| 87 void | |
| 1465 | 88 freebuffer (struct linebuffer *linebuffer) |
| 14 | 89 { |
| 90 free (linebuffer->buffer); | |
| 91 free (linebuffer); | |
| 92 } |