Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/linebuffer.c @ 3618:72422d1e9181
Include unlocked-io.h.
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Sat, 17 Nov 2001 13:29:42 +0000 |
| parents | 807294ed0f4f |
| children | 72b3b19fece2 |
| 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" |
| 14 | 28 |
| 29 char *xmalloc (); | |
| 30 char *xrealloc (); | |
| 31 void free (); | |
| 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; | |
| 40 linebuffer->buffer = (char *) xmalloc (linebuffer->size); | |
| 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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46 Return LINEBUFFER, except at end of file return 0. */ |
| 14 | 47 |
| 48 struct linebuffer * | |
| 1465 | 49 readline (struct linebuffer *linebuffer, FILE *stream) |
| 14 | 50 { |
| 51 int c; | |
| 52 char *buffer = linebuffer->buffer; | |
| 53 char *p = linebuffer->buffer; | |
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54 char *end = buffer + linebuffer->size; /* Sentinel. */ |
| 14 | 55 |
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56 if (feof (stream) || ferror (stream)) |
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57 return 0; |
| 14 | 58 |
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59 do |
| 14 | 60 { |
| 61 c = getc (stream); | |
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62 if (c == EOF) |
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63 { |
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64 if (p == buffer) |
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65 return 0; |
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66 if (p[-1] == '\n') |
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67 break; |
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68 c = '\n'; |
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69 } |
| 14 | 70 if (p == end) |
| 71 { | |
| 72 linebuffer->size *= 2; | |
| 73 buffer = (char *) xrealloc (buffer, linebuffer->size); | |
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74 p = p - linebuffer->buffer + buffer; |
| 14 | 75 linebuffer->buffer = buffer; |
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76 end = buffer + linebuffer->size; |
| 14 | 77 } |
| 78 *p++ = c; | |
| 79 } | |
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80 while (c != '\n'); |
| 14 | 81 |
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82 linebuffer->length = p - buffer; |
| 14 | 83 return linebuffer; |
| 84 } | |
| 85 | |
| 86 /* Free linebuffer LINEBUFFER and its data, all allocated with malloc. */ | |
| 87 | |
| 88 void | |
| 1465 | 89 freebuffer (struct linebuffer *linebuffer) |
| 14 | 90 { |
| 91 free (linebuffer->buffer); | |
| 92 free (linebuffer); | |
| 93 } |