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/*
* extractqqz.c: extract QuickQuiz answers from a latex document.
* The resulting answers can be included into an "answers" section
* of the document.
*
* 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, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
* Copyright (c) 2008-2019 Paul E. McKenney, IBM Corporation.
* Copyright (c) 2019 Paul E. McKenney, Facebook.
*/
/* Also need to follow \input statements. Which will require making the */
/* current_line and current_file vars passed through arglists. */
/* Also need to test various combinations... */
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <limits.h>
char *current_file = NULL;
long current_line = 0;
int ignore_line(FILE *fp, char *buf, int bufsiz)
{
do {
if (index(buf, '\n'))
return 1;
} while (fgets(buf, bufsiz, fp) != NULL);
return 0;
}
int output_line(FILE *fp, char *buf, int bufsiz)
{
do {
if (fputs(buf, stdout) == EOF) {
fprintf(stderr, "Output error: \"%s\":%d\n",
current_file, current_line);
exit(-1);
}
if (index(buf, '\n'))
return 1;
} while (fgets(buf, bufsiz, fp) != NULL);
return 0;
}
int output_line_addanswer(FILE *fp, char *buf, int bufsiz, char *outbuf)
{
char *abp;
char *ans = "Answer";
char *bp;
char *cbp;
char *obp;
cbp = index(buf, '{');
if (cbp == NULL)
abort();
for (bp = buf, obp = outbuf; bp < cbp; bp++, obp++)
*obp = *bp;
for (abp = ans; *abp; abp++, obp++)
*obp = *abp;
for (; *bp; bp++, obp++)
*obp = *bp;
*obp = '\0';
output_line(fp, outbuf, bufsiz);
}
void output_position()
{
printf("%% %s:%d\n", current_file, current_line);
}
int sc(char *cp, char *ccp, int bufsiz)
{
int s = strlen(ccp);
if (s > bufsiz)
s = bufsiz;
return (strncmp(cp, ccp, s));
}
#define STATE_SCANNING 0
#define STATE_QQZ 1
void do_one_file(char *fn)
{
char buf[PATH_MAX + 50];
char *cp;
char *fnp = NULL;
FILE *fp;
int lastqqz = 0;
char outbuf[PATH_MAX + 100];
int state;
current_file = fn;
current_line = 0;
if ((fp = fopen(fn, "r")) == NULL) {
fnp = malloc(strlen(fn) + 10);
strcpy(fnp, fn);
strcat(fnp, ".tex");
current_file = fnp;
if ((fp = fopen(fnp, "r")) == NULL) {
current_file = fn;
perror(fn);
goto outerr;
}
}
state = STATE_SCANNING;
while ((cp = fgets(buf, sizeof(buf), fp)) != NULL) {
current_line++;
if (state == STATE_QQZ) {
if (sc(buf, "\\QuickQuizEnd", sizeof(buf)) == 0) {
state = STATE_SCANNING;
ignore_line(fp, buf, sizeof(buf));
continue;
}
if ((sc(buf, "\\QuickQuiz{", sizeof(buf)) == 0) ||
(sc(buf, "\\QuickQuizChapter{", sizeof(buf)) == 0)) {
fprintf(stderr, "%s:%d: Bad directive\n",
current_file, current_line);
goto outerr;
}
output_line(fp, buf, sizeof(buf));
continue;
}
/* state == STATE_SCANNING */
if (sc(buf, "\\QuickQuizChapter{", sizeof(buf)) == 0) {
output_line_addanswer(fp, buf, sizeof(buf), outbuf);
continue;
}
if (sc(buf, "\\QuickQuiz{", sizeof(buf)) == 0) {
state = STATE_QQZ;
lastqqz = current_line;
output_position();
output_line_addanswer(fp, buf, sizeof(buf), outbuf);
continue;
}
if (sc(buf, "\\QuickQuizEnd", sizeof(buf)) == 0) {
fprintf(stderr, "%s:%d: Bad directive\n",
current_file, current_line);
goto outerr;
}
if (sc(buf, "\\input", sizeof(buf)) == 0) {
char *opencurly = index(buf, '{');
char *closecurly = index(buf, '}');
char *savefn = current_file;
int saveline = current_line;
if (opencurly == NULL || closecurly == NULL) {
fprintf(stderr,
"%s:%d: Malformed \\input{path}\n",
current_file, current_line);
goto outerr;
}
*closecurly = '\0';
do_one_file(opencurly + 1);
*closecurly = '}';
current_file = savefn;
current_line = saveline;
}
ignore_line(fp, buf, sizeof(buf));
}
if (state != STATE_SCANNING) {
fprintf(stderr,
"%s:%d: \\QuickQuiz without \\QuickQuizEnd\n",
current_file, lastqqz);
}
if (fnp != NULL)
free(fnp);
return;
outerr:
if (fnp != NULL)
free(fnp);
exit(-1);
}
int main(int argc, char *argv[])
{
int i;
for (i = 1; i < argc; i++)
do_one_file(argv[i]);
return 0;
}
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