diff options
Diffstat (limited to 'lib/linebuffer.c')
-rw-r--r-- | lib/linebuffer.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/lib/linebuffer.c b/lib/linebuffer.c new file mode 100644 index 000000000..7f53aed70 --- /dev/null +++ b/lib/linebuffer.c @@ -0,0 +1,91 @@ +/* linebuffer.c -- read arbitrarily long lines + Copyright (C) 1986, 1991 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Written by Richard Stallman. */ + +#include <stdio.h> +#include "linebuffer.h" + +char *xmalloc (); +char *xrealloc (); +void free (); + +/* Initialize linebuffer LINEBUFFER for use. */ + +void +initbuffer (linebuffer) + struct linebuffer *linebuffer; +{ + linebuffer->length = 0; + linebuffer->size = 200; + linebuffer->buffer = (char *) xmalloc (linebuffer->size); +} + +/* Read an arbitrarily long line of text from STREAM into LINEBUFFER. + Remove any newline. Does not null terminate. + Return LINEBUFFER, except at end of file return 0. */ + +struct linebuffer * +readline (linebuffer, stream) + struct linebuffer *linebuffer; + FILE *stream; +{ + int c; + char *buffer = linebuffer->buffer; + char *p = linebuffer->buffer; + char *end = buffer + linebuffer->size; /* Sentinel. */ + + if (feof (stream)) + { + linebuffer->length = 0; + return 0; + } + + while (1) + { + c = getc (stream); + if (p == end) + { + linebuffer->size *= 2; + buffer = (char *) xrealloc (buffer, linebuffer->size); + p += buffer - linebuffer->buffer; + linebuffer->buffer = buffer; + end = buffer + linebuffer->size; + } + if (c == EOF || c == '\n') + break; + *p++ = c; + } + + if (feof (stream) && p == buffer) + { + linebuffer->length = 0; + return 0; + } + linebuffer->length = p - linebuffer->buffer; + return linebuffer; +} + +/* Free linebuffer LINEBUFFER and its data, all allocated with malloc. */ + +void +freebuffer (linebuffer) + struct linebuffer *linebuffer; +{ + free (linebuffer->buffer); + free (linebuffer); +} |