NetBSD-5.0.2/distrib/utils/sysinst/txtwalk.c
/* $NetBSD: txtwalk.c,v 1.12 2006/01/12 22:02:44 dsl Exp $ */
/*
* Copyright 1997 Piermont Information Systems Inc.
* All rights reserved.
*
* Written by Philip A. Nelson for Piermont Information Systems Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, item list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, item list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of item software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Piermont Information Systems Inc.
* 4. The name of Piermont Information Systems Inc. may not be used to endorse
* or promote products derived from item software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* walk a text buffer, processing matched lines
*
* Written by Philip A. Nelson.
* 7/29/97
*
*/
#undef DEBUG
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
#include "txtwalk.h"
/* prototypes */
static int process(const struct lookfor *, char *);
static int match(char *, const struct lookfor *, size_t);
static int finddata(const struct lookfor *, char *, struct data *, size_t *);
/*
* Walk the buffer, call match for each line.
*/
int
walk(char *buffer, size_t size, const struct lookfor *these, size_t numthese)
{
size_t i = 0;
size_t len;
int line = 1;
int error;
while (i < size) {
/* Ignore zero characters. */
if (*buffer == '\0') {
buffer++;
i++;
} else {
/* Assume item starts a line. */
len = 0;
while (buffer[len] != '\n' && buffer[len] != '\0')
len++;
buffer[len] = '\0';
#ifdef DEBUG
printf ("%5d: %s\n", line, buffer);
#endif
error = match(buffer, these, numthese);
if (error != 0)
return error;
buffer += len+1;
i += len+1;
line++;
}
}
return 0;
}
/*
* Match the current line with a string of interest.
* For each match in these, process the match.
*/
static int
match(char *line, const struct lookfor *these, size_t numthese)
{
size_t linelen; /* Line length */
size_t patlen; /* Pattern length */
size_t which; /* Which pattern we are using */
int error;
linelen = strlen(line);
for (which = 0; which < numthese; which++) {
patlen = strlen(these[which].head);
if (linelen < patlen)
continue;
if (strncmp(these[which].head, line, patlen) == 0) {
error = process(&these[which], line);
if (error != 0)
return error;
}
}
return 0;
}
/* process the matched line. */
static int
process(const struct lookfor *item, char *line)
{
struct data found[MAXDATA];
size_t numfound = 0;
const char *p;
char *np;
size_t i, j;
int error;
if (finddata(item, line, found, &numfound)) {
#ifdef DEBUG
printf("process: \"%s\"\n", line);
for (i = 0; i < numfound; i++) {
printf ("\t%d: ", i);
switch (found[i].what) {
case INT:
printf ("%d\n", found[i].u.i_val);
break;
case STR:
printf ("'%s'\n", found[i].u.s_val);
break;
}
}
#endif
/* Process the stuff. */
switch (item->todo[0]) {
case 'a': /* Assign data */
p = item->todo;
j = 0;
while (*p && *p != '$')
p++;
if (*p)
p++;
for (;;) {
i = strtoul(p, &np, 10);
if (p == np)
break;
p = np;
switch (found[i].what) {
case INT:
*((int *)item->var+j)
= found[i].u.i_val;
break;
case STR:
strlcpy(*((char **)item->var+j),
found[i].u.s_val,
item->size);
break;
}
while (*p && *p != '$')
p++;
if (*p)
p++;
j++;
if (j >= item->nument)
break;
}
break;
case 'c': /* Call a function with data. */
error = (*item->func)(found, numfound);
if (error != 0)
return error;
break;
}
}
return 0;
}
/*
* find the expected data. Return 1 if successful, return 0 if not.
* Successful means running into the end of the expect string before
* running out of line data or encountering other bad data.
*
* Side Effect -- sets numfound and found.
*/
static int
finddata(const struct lookfor *item, char *line, struct data *found, size_t *numfound)
{
const char *fmt;
size_t len;
char *np;
int i;
*numfound = 0;
for (fmt = item->fmt; *fmt; fmt++) {
if (!*line && *fmt)
return 0;
if (*fmt == '%') {
fmt++;
if (!*fmt)
return 0;
switch (*fmt) {
case '%': /* The char %. */
if (*line != '%')
return 0;
line++;
break;
case 'i': /* Ignore characters */
if (!fmt[1])
return 1;
if (fmt[1] == ' ')
while (*line && !isspace((unsigned char)*line))
line++;
else
while (*line && *line != fmt[1])
line++;
break;
case 'd': /* Nextoken should be an integer. */
i = strtoul(line, &np, 10);
if (line == np)
return 0;
found[*numfound].what = INT;
found[(*numfound)++].u.i_val = i;
line = np;
break;
case 's': /* Matches a 'space' separated string. */
len = 0;
while (line[len] && !isspace((unsigned char)line[len])
&& line[len] != fmt[1])
len++;
found[*numfound].what = STR;
found[(*numfound)++].u.s_val = line;
line[len] = 0;
line += len + 1;
break;
default:
return 0;
}
continue;
}
if (*fmt == ' ') {
while (isspace((unsigned char)*line))
line++;
continue;
}
if (*line == *fmt) {
line++;
continue;
}
/* Mis match! */
return 0;
}
/* Ran out of fmt. */
return 1;
}