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gottox@rootkit.lan 2007-12-10 02:35:44 +01:00
commit 10a52a6dbb
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#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
struct Tag {
char *search;
int hasChilds;
char *prefix, *suffix;
};
typedef unsigned int (*Parser)(const char *, const char *);
#define BUFFERSIZE 1024
#define ERRMALLOC eprint("malloc failed\n");
#define LENGTH(x) sizeof(x)/sizeof(x[0])
FILE *source;
unsigned int bsize = 0;
struct Tag lineprefix[] = {
{ " ", 0, "<pre>", "</pre>" },
{ "\t", 0, "<pre>", "</pre>" },
{ "> ", 1, "<blockquote>", "</blockquote>" },
};
struct Tag underline[] = {
{ "=", 1, "<h1>", "</h1>" },
{ "-", 1, "<h2>", "</h2>" },
};
struct Tag surround[] = {
{ "_", 1, "<b>", "</b>" },
{ "*", 1, "<i>", "</i>" },
};
char * replace[][2] = {
{ "\n---\n", "\n<hr />\n" },
{ "\n\n", "\n<br />\n" },
{ "<", "&lt;" },
{ ">", "&gt;" },
{ "&", "&amp;" },
{ "\"", "&quot;" },
};
void eprint(const char *errstr, ...);
void process(const char *begin, const char *end, Parser parser);
unsigned int doreplace(const char *begin, const char *end);
unsigned int dolineprefix(const char *begin, const char *end);
unsigned int dosurround(const char *begin, const char *end);
unsigned int dounderline(const char *begin, const char *end);
unsigned int dolink(const char *begin, const char *end);
Parser parsers[] = { dounderline, dolineprefix, dosurround, dolink, doreplace };
void
eprint(const char *errstr, ...) {
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
unsigned int
dolink(const char *begin, const char *end) {
int img;
const char *desc, *link, *p;
unsigned int desclen, linklen;
if(*begin != '[' && strncmp(begin,"![",2) != 0)
return 0;
img = 1;
if(*begin == '[')
img = 0;
desc = begin + 1 + img;
if(!(p = strstr(desc, "](")) || p > end)
return 0;
desclen = p - desc;
link = p + 2;
if(!(p = strstr(link, ")")) || p > end)
return 0;
linklen = p - link;
if(img) {
fputs("<img src=\"",stdout);
process(link,link+linklen, doreplace);
fputs("\" alt=\"",stdout);
process(desc,desc+desclen, NULL);
fputs("\" />",stdout);
}
else {
fputs("<a href=\"",stdout);
process(link,link+linklen, doreplace);
fputs("\">",stdout);
process(desc,desc+desclen, NULL);
fputs("</a>",stdout);
}
return p + 1 - begin;
}
unsigned int
dosurround(const char *begin, const char *end) {
unsigned int i,l;
const char *p,*ps;
for(i = 0; i < LENGTH(surround); i++) {
l = strlen(surround[i].search);
if(end - begin < l || strncmp(begin,surround[i].search,l) != 0)
continue;
for(ps = surround[i].search; *ps == '\n'; ps++);
l = strlen(ps);
p = strstr(begin + strlen(surround[i].search), ps);
if(!p || p > end)
continue;
fputs(surround[i].prefix,stdout);
fwrite(begin + strlen(surround[i].search), sizeof(char), p - begin - l, stdout);
fputs(surround[i].suffix,stdout);
return p - begin + l;
}
return 0;
}
unsigned int
doreplace(const char *begin, const char *end) {
unsigned int i, l;
for(i = 0; i < LENGTH(replace); i++) {
l = strlen(replace[i][0]);
if(end - begin < l)
continue;
if(strncmp(replace[i][0],begin,l) == 0) {
fputs(replace[i][1], stdout);
return l;
}
}
return 0;
}
unsigned int
dolineprefix(const char *begin, const char *end) {
unsigned int i, j, l;
char *buffer;
const char *p;
if(*begin != '\n' && *begin != '\0')
return 0;
for(i = 0; i < LENGTH(lineprefix); i++) {
l = strlen(lineprefix[i].search);
if(end - begin+1 < l)
continue;
if(strncmp(lineprefix[i].search,begin+1,l))
continue;
if(!(buffer = malloc(end - begin+1)))
ERRMALLOC;
fputs(lineprefix[i].prefix, stdout);
for(p = begin, j = 0; p != end; p++, j++) {
buffer[j] = *p;
if(*p == '\n') {
if(strncmp(lineprefix[i].search,p+1,l) != 0)
break;
p += l;
}
}
if(lineprefix[i].hasChilds)
process(buffer,buffer+strlen(buffer), NULL);
else
fputs(buffer, stdout);
fputs(lineprefix[i].suffix, stdout);
free(buffer);
return p - begin;
}
return 0;
}
unsigned int
dounderline(const char *begin, const char *end) {
unsigned int i, j, l;
const char *p;
if(*begin != '\n' && *begin != '\0')
return 0;
for(p = begin+1,l = 0; p[l] != '\n' && p[l] && p+l != end; l++);
p += l+1;
if(l == 0)
return 0;
for(i = 0; i < LENGTH(underline); i++) {
for(j = 0; p[j] != '\n' && p[j] == underline[i].search[0] && p+j != end; j++);
if(j >= l) {
putchar('\n');
fputs(underline[i].prefix,stdout);
if(underline[i].hasChilds)
process(begin + 1, begin + l + 1, NULL);
else
fwrite(begin + 1, l, sizeof(char), stdout);
fputs(underline[i].suffix,stdout);
return j + l + 2;
}
}
return 0;
}
void
process(const char *begin, const char *end, Parser parser) {
const char *p;
int affected;
unsigned int i;
for(p = begin; *p && p != end;) {
affected = 0;
if(parser)
affected = parser(p, end);
else
for(i = 0; i < LENGTH(parsers) && affected == 0; i++)
affected = parsers[i](p, end);
if(affected == 0) {
putchar(*p);
p++;
}
else
p += affected;
}
}
int
main(int argc, char *argv[]) {
char *p, *buffer;
int s;
source = stdin;
if(argc > 1 && strcmp("-v", argv[1]) == 0)
eprint("markdown in C "VERSION" (C) Enno Boland\n");
else if(argc > 1 && strcmp("-h", argv[1]) == 0)
eprint("Usage markdown [file]\n");
else if (argc > 1 && strcmp("-", argv[1]) != 0 && !(source = fopen(argv[1],"r")))
eprint("Cannot open file `%s`\n",argv[1]);
if(!(buffer = malloc(BUFFERSIZE)))
ERRMALLOC;
bsize = BUFFERSIZE;
strcpy(buffer,"\n");
p = buffer+strlen(buffer);
while(s = fread(p, sizeof(char),BUFFERSIZE, source)) {
p += s;
*p = '\0';
if(BUFFERSIZE + strlen(buffer) > bsize) {
bsize += BUFFERSIZE;
if(!(buffer = realloc(buffer, bsize)))
ERRMALLOC;
}
}
process(buffer,buffer+strlen(buffer), NULL);
free(buffer);
}