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/*
* Copyright (c) 2002, 2004 Tama Communications Corporation
*
* This file is part of GNU GLOBAL.
*
* GNU GLOBAL 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.
*
* GNU GLOBAL 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <sys/stat.h>
#include "die.h"
#include "linetable.h"
#include "varray.h"
#include "strbuf.h"
/* File buffer */
#define EXPAND 1024
static STRBUF *ib;
static char *filebuf;
static int filesize;
/* File pointer */
static char *curp;
static char *endp;
/* Offset table */
VARRAY *vb;
static void linetable_put(int, int);
/*
* linetable_open: load whole of file into memory.
*
* i) path path
* r) 0: normal
* -1: cannot open file.
*/
int
linetable_open(path)
const char *path;
{
FILE *ip;
struct stat sb;
int lineno, offset;
if (stat(path, &sb) < 0)
return -1;
ib = strbuf_open(sb.st_size);
vb = varray_open(sizeof(int), EXPAND);
if ((ip = fopen(path, "r")) == NULL)
return -1;
lineno = 1;
offset = 0;
for (offset = 0;
(strbuf_fgets(ib, ip, STRBUF_APPEND), offset != strbuf_getlen(ib));
offset = strbuf_getlen(ib))
{
linetable_put(offset, lineno++);
}
fclose(ip);
curp = filebuf = strbuf_value(ib);
filesize = offset;
endp = filebuf + filesize;
/* strbuf_close(ib); */
return 0;
}
/*
* linetable_read: read(2) compatible routine for linetable.
*
* io) buf read buffer
* i) size buffer size
* r) ==-1: end of file
* !=-1: number of bytes actually read
*/
int
linetable_read(buf, size)
char *buf;
int size;
{
int leaved = endp - curp;
if (leaved <= 0)
return -1; /* EOF */
if (size > leaved)
size = leaved;
memcpy(buf, curp, size);
curp += size;
return size;
}
/*
* linetable_put: put a line into table.
*
* i) offset offset of the line
* i) lineno line number of the line (>= 1)
*/
void
linetable_put(offset, lineno)
int offset;
int lineno;
{
int *entry;
if (lineno <= 0)
die("linetable_put: line number must >= 1 (lineno = %d)", lineno);
entry = varray_assign(vb, lineno - 1, 1);
*entry = offset;
}
/*
* linetable_get: get a line from table.
*
* i) lineno line number of the line (>= 1)
* o) offset offset of the line
* if offset == NULL, nothing returned.
* r) line pointer
*/
char *
linetable_get(lineno, offset)
int lineno;
int *offset;
{
int addr;
if (lineno <= 0)
die("linetable_get: line number must >= 1 (lineno = %d)", lineno);
addr = *((int *)varray_assign(vb, lineno - 1, 0));
if (offset)
*offset = addr;
return filebuf + addr;
}
/*
* linetable_close: close line table.
*/
void
linetable_close(void)
{
varray_close(vb);
strbuf_close(ib);
}
/*
* linetable_print: print a line.
*
* i) op output file pointer
* i) lineno line number (>= 1)
*/
void
linetable_print(op, lineno)
FILE *op;
int lineno;
{
const char *s, *p;
if (lineno <= 0)
die("linetable_print: line number must >= 1 (lineno = %d)", lineno);
s = linetable_get(lineno, NULL);
if (s == NULL)
return;
for (p = s; *p != '\n'; p++)
;
if (p > s)
fwrite(s, 1, p - s, op);
fputc('\n', op);
}
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