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/* getshline.c -- read a meaningfull line from a file
Copyright (C) 1993, 1996 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 of the
License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */
/* Written by Akim Demaille, demaille@inf.enst.fr
* from getline.c by Jan Brittenson, bson@gnu.ai.mit.edu. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#if HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <assert.h>
#include "xalloc.h"
#include "getshline.h"
/* Always add at least this many bytes when extending the buffer. */
#define MIN_CHUNK 64
/* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
+ OFFSET (and null-terminate it). *LINEPTR is a pointer returned from
malloc (or NULL), pointing to *N characters of space. It is realloc'd
as necessary. Return the number of characters read (not including the
null terminator), or -1 on error or EOF. */
static int
getshstr (int * firstline, int * lastline,
char ** lineptr, size_t * n,
FILE * stream,
char terminator, int terminator_quote, int commentor,
size_t offset)
{
int nchars_avail; /* Allocated but unused chars in *LINEPTR. */
char *read_pos; /* Where we're reading into *LINEPTR. */
int ret;
if (!lineptr || !n || !stream)
return -1;
if (!*lineptr)
{
*n = MIN_CHUNK;
*lineptr = XMALLOC (char, *n);
if (!*lineptr)
return -1;
}
/* We are reading a new line */
*firstline = ++(*lastline);
nchars_avail = *n - offset;
read_pos = *lineptr + offset;
for (;;)
{
register int c = getc (stream);
/* We always want at least one char left in the buffer, since we
always (unless we get an error while reading the first char)
NUL-terminate the line buffer. */
assert(*n + *lineptr == read_pos + nchars_avail);
if (nchars_avail < 2)
{
if (*n > MIN_CHUNK)
*n *= 2;
else
*n += MIN_CHUNK;
nchars_avail = *n + *lineptr - read_pos;
*lineptr = XREALLOC (*lineptr, char, *n);
if (!*lineptr)
return -1;
read_pos = *n - nchars_avail + *lineptr;
assert(*n + *lineptr == read_pos + nchars_avail);
}
if (c == EOF || ferror (stream))
{
/* Return partial line, if any. */
if (read_pos == *lineptr)
return -1;
else
break;
}
*read_pos++ = c;
nchars_avail--;
if (c == terminator)
{
/* The comment lines can not be continued by an
* escaped eol, so test this before quotation of eol */
if (**lineptr == terminator || **lineptr == commentor)
{
/* We just read a blank line. Then we are reading
* a new first line */
*firstline = *lastline + 1;
return (getshstr (firstline, lastline, lineptr, n, stream,
terminator, terminator_quote, commentor,
offset));
}
if ((read_pos - 2 <= *lineptr)
|| (*(read_pos - 2) != terminator_quote))
/* Return the line. */
break;
/* The line is continued because the eol was quoted,
* hence lastline has to be incremented */
read_pos -= 2;
nchars_avail += 2;
(*lastline)++;
}
}
/* Done - NUL terminate and return the number of chars read. */
*read_pos = '\0';
ret = read_pos - (*lineptr + offset);
return ret;
}
int
getshline_numbered (int * firstline, int * lastline,
char ** lineptr, size_t * n, FILE * stream)
{
return getshstr (firstline, lastline, lineptr, n, stream,
'\n', '\\', '#', 0);
}
int
getshline (char ** lineptr, size_t * n, FILE * stream)
{
int firstline, lastline;
return getshstr (&firstline, &lastline, lineptr, n, stream,
'\n', '\\', '#', 0);
}
int
getshdelim_numbered (int * firstline, int * lastline,
char ** lineptr, size_t * n,
int delimiter, int delimiter_quote, int commentor,
FILE * stream)
{
return getshstr (firstline, lastline, lineptr, n, stream,
delimiter, delimiter_quote, commentor, 0);
}
int
getshdelim (char ** lineptr, size_t * n,
int delimiter, int delimiter_quote, int commentor,
FILE * stream)
{
int firstline, lastline;
return getshstr (&firstline, &lastline, lineptr, n, stream,
delimiter, delimiter_quote, commentor, 0);
}
#ifdef TEST
const char * program_name = "getsh";
int
main(int argc, char *argv[])
{
int firstline = 0, lastline = 0;
char * line_content = NULL;
int line_size = 0;
FILE * file;
int res;
if (argc < 2)
exit (1);
file = fopen (argv[1], "r");
if (!file)
exit (1);
while ((res = getshline_numbered (&firstline, &lastline,
&line_content, &line_size, file)) != -1)
printf ("%3d-%3d:%s", firstline, lastline, line_content);
free (line_content);
return 0;
}
#endif
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