281 lines
6.6 KiB
C
281 lines
6.6 KiB
C
/* $NetBSD: txtwalk.c,v 1.9 2003/07/25 08:26:22 dsl Exp $ */
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/*
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* Copyright 1997 Piermont Information Systems Inc.
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* All rights reserved.
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*
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* Written by Philip A. Nelson for Piermont Information Systems Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, item list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, item list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of item software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Piermont Information Systems Inc.
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* 4. The name of Piermont Information Systems Inc. may not be used to endorse
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* or promote products derived from item software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* walk a text buffer, processing matched lines
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*
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* Written by Philip A. Nelson.
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* 7/29/97
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*
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*/
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#undef DEBUG
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "txtwalk.h"
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/* prototypes */
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static void process(struct lookfor *, char *);
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static void match(char *, struct lookfor *, size_t);
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static int finddata(struct lookfor *, char *, struct data *, size_t *);
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static char *strndup(char *, size_t);
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/*
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* Walk the buffer, call match for each line.
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*/
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void
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walk(char *buffer, size_t size, struct lookfor *these, size_t numthese)
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{
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size_t i = 0;
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size_t len;
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int line = 1;
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while (i < size) {
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/* Ignore zero characters. */
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if (*buffer == '\0') {
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buffer++;
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i++;
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} else {
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/* Assume item starts a line. */
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len = 0;
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while (buffer[len] != '\n' && buffer[len] != '\0')
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len++;
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buffer[len] = '\0';
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#ifdef DEBUG
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printf ("%5d: %s\n", line, buffer);
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#endif
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match(buffer, these, numthese);
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buffer += len+1;
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i += len+1;
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line++;
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}
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}
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}
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/*
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* Match the current line with a string of interest.
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* For each match in these, process the match.
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*/
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static void
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match(char *line, struct lookfor *these, size_t numthese)
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{
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size_t linelen; /* Line length */
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size_t patlen; /* Pattern length */
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size_t which; /* Which pattern we are using */
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linelen = strlen(line);
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for (which = 0; which < numthese; which++) {
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patlen = strlen(these[which].head);
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if (linelen < patlen)
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continue;
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if (strncmp(these[which].head, line, patlen) == 0)
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process(&these[which], line);
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}
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}
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/* process the matched line. */
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static void
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process(struct lookfor *item, char *line)
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{
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struct data found[MAXDATA];
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size_t numfound = 0;
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const char *p;
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size_t i, j;
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if (finddata(item, line, found, &numfound)) {
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#ifdef DEBUG
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printf("process: \"%s\"\n", line);
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for (i = 0; i < numfound; i++) {
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printf ("\t%d: ", i);
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switch (found[i].what) {
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case INT:
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printf ("%d\n", found[i].u.i_val);
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break;
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case STR:
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printf ("'%s'\n", found[i].u.s_val);
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break;
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}
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}
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#endif
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/* Process the stuff. */
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switch (item->todo[0]) {
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case 'a': /* Assign data */
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p = item->todo;
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j = 0;
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while (*p && *p != '$')
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p++;
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if (*p)
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p++;
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while (*p && isdigit(*p)) {
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i = atoi(p);
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switch (found[i].what) {
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case INT:
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*((int *)item->var+j)
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= found[i].u.i_val;
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break;
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case STR:
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strncpy(*((char **)item->var+j),
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found[i].u.s_val,
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item->size-1);
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found[i].u.s_val[item->size-1] = 0;
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break;
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}
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while (isdigit(*p))
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p++;
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while (*p && *p != '$')
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p++;
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if (*p)
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p++;
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j++;
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if (j >= item->nument)
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break;
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}
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break;
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case 'c': /* Call a function with data. */
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(*item->func)(found, numfound);
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break;
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}
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}
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}
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/*
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* find the expected data. Return 1 if successful, return 0 if not.
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* Successful means running into the end of the expect string before
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* running out of line data or encountering other bad data.
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*
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* Side Effect -- sets numfound and found.
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*/
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static int
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finddata(struct lookfor *item, char *line, struct data *found, size_t *numfound)
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{
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const char *fmt = item->fmt;
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size_t len;
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*numfound = 0;
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while (*fmt) {
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if (!*line && *fmt)
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return 0;
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if (*fmt == '%') {
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fmt++;
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if (!*fmt)
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return 0;
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switch (*fmt) {
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case '%': /* The char %. */
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if (*line != '%')
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return 0;
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line++;
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break;
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case 'i': /* Ignore characters */
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if (!fmt[1])
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return 1;
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if (fmt[1] == ' ')
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while (*line && !isspace(*line))
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line++;
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else
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while (*line && *line != fmt[1])
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line++;
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break;
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case 'd': /* Nextoken should be an integer. */
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if (!isdigit(*line))
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return 0;
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found[*numfound].what = INT;
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found[(*numfound)++].u.i_val = atoi(line);
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while (*line && isdigit(*line))
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line++;
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break;
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case 's': /* Matches a 'space' separated string. */
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len = 0;
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while (line[len] && !isspace(line[len])
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&& line[len] != fmt[1])
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len++;
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found[*numfound].what = STR;
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found[*numfound].u.s_val = strndup(line, len);
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if (found[(*numfound)++].u.s_val == NULL) {
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(void)fprintf(stderr,
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"msgwalk: strndup: out of vm.\n");
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exit(1);
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}
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line += len;
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break;
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default:
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return 0;
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}
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} else if (*fmt == ' ') {
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while (*line && isspace(*line))
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line++;
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} else if (*line == *fmt) {
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line++;
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} else {
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/* Mis match! */
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return 0;
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}
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fmt++;
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}
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/* Ran out of fmt. */
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return 1;
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}
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/*
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* Utility routines....
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*/
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static char *
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strndup(char *str, size_t len)
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{
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size_t alen;
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char *val;
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alen = strlen(str);
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alen = len < alen ? len + 1 : alen + 1;
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val = malloc(alen);
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if (!val)
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return NULL;
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strlcpy(val, str, alen);
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return val;
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}
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