commit 10a52a6dbb76052e74552b5800c9dd7327767284
Author: gottox@rootkit.lan <gottox@rootkit.lan>
Date: Mon, 10 Dec 2007 02:35:44 +0100
Initial checkin
Diffstat:
| A | markdown.c | | | 255 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
1 file changed, 255 insertions(+), 0 deletions(-)
diff --git a/markdown.c b/markdown.c
@@ -0,0 +1,255 @@
+#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" },
+ { "<", "<" },
+ { ">", ">" },
+ { "&", "&" },
+ { "\"", """ },
+};
+
+
+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);
+}
