pre2html

commit 2979e095696aa23e46434354e8518e974551f328
Author: Tomas Hlavaty <tom@logand.com>
Date:   Mon,  5 Sep 2011 23:33:10 +0200

initial commit

Diffstat:
A
Makefile
 | 
5
+++++
A
text2html.c
 | 
81
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 86 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -0,0 +1,5 @@
+all: text2html
+
+text2html: text2html.o
+	$(CC) -o $@ $<
+	strip $@
diff --git a/text2html.c b/text2html.c
@@ -0,0 +1,81 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+enum {
+  BLEN = 10240
+};
+
+static int line(char *buf, char *end) {
+  int n = 0;
+  while(buf < end) {
+    int c = getchar();
+    if(EOF == c) break;
+    *buf++ = c;
+    n++;
+    if('\n' == c) break;
+  }
+  return n;
+}
+
+static int head(char *what, char *buf, char *end) {
+  while(*what && buf < end) {
+    if(*what++ != *buf++) return 0;
+  }
+  return 1;
+}
+
+static char *find(char what, char *buf, char *end) {
+  for(; buf < end; buf++)
+    if(what == *buf) return buf;
+  return NULL;
+}
+
+static void attr(char *buf, char *end) {
+  for(; buf < end; buf++)
+    switch(*buf) {
+    case '"': printf("&quot;"); break;
+    default: putchar(*buf);
+    }
+}
+
+static escape(char c) {
+  switch(c) {
+  case '<': printf("&lt;"); break;
+  case '>': printf("&gt;"); break;
+  case '&': printf("&amp;"); break;
+  case '"': printf("&quot;"); break;
+  default: putchar(c);
+  }
+}
+
+static void text(char *buf, char *end) {
+  for(; buf < end; buf++)
+    escape(*buf);
+}
+
+int main() {
+  char buf[BLEN];
+  char *end = buf + BLEN;
+  int n;
+  puts("<pre>");
+  while(0 < (n = line(buf, end))) {
+    char *b = buf;
+    char *e = buf + n;
+    while(b < e) {
+      if(head("<http:", b, e) || head("<https:", b, e)) {
+        escape(*b++);
+        char *n = find('>', b, e);
+        printf("<a href=\"");
+        attr(b, n);
+        printf("\">");
+        text(b, n);
+        printf("</a>");
+        b = n;
+        escape(*b++);
+      }
+      else escape(*b++);
+    }
+  }
+  puts("</pre>");
+  return 0;
+}