X-Git-Url: https://git.distorted.org.uk/~mdw/mLib/blobdiff_plain/78b1464e4a78dc364ecc8aebcfd5ec13b3f6bb07..4aee39a18184ae8595936a03ad254c27d149a0eb:/url.c

diff --git a/url.c b/url.c
index 532a052..797c536 100644
--- a/url.c
+++ b/url.c
@@ -1,13 +1,13 @@
 /* -*-c-*-
  *
- * $Id: url.c,v 1.4 2001/06/22 19:36:18 mdw Exp $
+ * $Id: url.c,v 1.5 2004/04/08 01:36:13 mdw Exp $
  *
  * Parsing and construction of url-encoded name/value pairs
  *
  * (c) 1999 Straylight/Edgeware
  */
 
-/*----- Licensing notice --------------------------------------------------* 
+/*----- Licensing notice --------------------------------------------------*
  *
  * This file is part of the mLib utilities library.
  *
@@ -15,35 +15,18 @@
  * it under the terms of the GNU Library General Public License as
  * published by the Free Software Foundation; either version 2 of the
  * License, or (at your option) any later version.
- * 
+ *
  * mLib 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 Library General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU Library General Public
  * License along with mLib; if not, write to the Free
  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: url.c,v $
- * Revision 1.4  2001/06/22 19:36:18  mdw
- * Include @<ctype.h>@.
- *
- * Revision 1.3  2001/01/20 12:06:21  mdw
- * Be more conservative in base-64 encoding.
- *
- * Revision 1.2  1999/09/03 08:02:05  mdw
- * Make `#' a special character which needs escaping.
- *
- * Revision 1.1  1999/06/01 09:49:48  mdw
- * New files for url-encoding and decoding.
- *
- */
-
 /*----- Header files ------------------------------------------------------*/
 
 #include <ctype.h>
@@ -65,14 +48,12 @@
  * Use:		Initializes a URL encoding context.
  */
 
-void url_initenc(url_ectx *ctx)
-{
-  ctx->f = 0;
-}
+void url_initenc(url_ectx *ctx) { ctx->f = 0; }
 
 /* --- @encode@ --- *
  *
- * Arguments:	@dstr *d@ = pointer to output string
+ * Arguments:	@url_ectx *ctx@ = encoding context
+ *		@dstr *d@ = pointer to output string
  *		@const char *p@ = pointer to thing to encode
  *
  * Returns:	---
@@ -80,19 +61,36 @@ void url_initenc(url_ectx *ctx)
  * Use:		Encodes the input string into the output string.
  */
 
-static void encode(dstr *d, const char *p)
+static void encode(url_ectx *ctx, dstr *d, const char *p)
 {
   while (*p) {
     switch (*p) {
       case ' ':
 	DPUTC(d, '+');
-        break;
+	break;
       default:
-        if (isalnum((unsigned char)*p))
-	  DPUTC(d, *p);
-        else
-	  dstr_putf(d, "%%%02x", *p);
-        break;
+	if ((ctx->f & URLF_LAX) || isalnum((unsigned char)*p))
+	  goto safe;
+	else
+	  goto unsafe;
+      case '/':
+      case '~':
+	if (ctx->f & URLF_STRICT)
+	  goto unsafe;
+      case '-':
+      case '.':
+      case '_':
+      safe:
+	DPUTC(d, *p);
+	break;
+      unsafe:
+      case '+':
+      case '%':
+      case '=':
+      case '&':
+      case ';':
+	dstr_putf(d, "%%%02x", *p);
+	break;
     }
     p++;
   }
@@ -114,10 +112,10 @@ static void encode(dstr *d, const char *p)
 void url_enc(url_ectx *ctx, dstr *d, const char *name, const char *value)
 {
   if (ctx->f & URLF_SEP)
-    DPUTC(d, '&');
-  encode(d, name);
+    DPUTC(d, (ctx->f & URLF_SEMI) ? ';' : '&');
+  encode(ctx, d, name);
   DPUTC(d, '=');
-  encode(d, value);
+  encode(ctx, d, value);
   DPUTZ(d);
   ctx->f |= URLF_SEP;
 }
@@ -132,14 +130,12 @@ void url_enc(url_ectx *ctx, dstr *d, const char *name, const char *value)
  * Use:		Initializes a URL decoding context.
  */
 
-void url_initdec(url_dctx *ctx, const char *p)
-{
-  ctx->p = p;
-}
+void url_initdec(url_dctx *ctx, const char *p) { ctx->p = p; ctx->f = 0; }
 
 /* --- @decode@ --- *
  *
- * Arguments:	@dstr *d@ = pointer to output string
+ * Arguments:	@url_dctx *ctx@ = pointer to the context
+ *		@dstr *d@ = pointer to output string
  *		@const char *p@ = pointer to input data
  *		@int eq@ = whether to stop at `=' characters
  *
@@ -148,7 +144,7 @@ void url_initdec(url_dctx *ctx, const char *p)
  * Use:		Does a URL decode.
  */
 
-static const char *decode(dstr *d, const char *p, int eq)
+static const char *decode(url_dctx *ctx, dstr *d, const char *p, int eq)
 {
   if (!*p)
     return (0);
@@ -157,8 +153,11 @@ static const char *decode(dstr *d, const char *p, int eq)
       case '=':
 	if (eq)
 	  return (p);
-	DPUTC(d, *p);
-	break;
+	goto boring;
+      case ';':
+	if (ctx->f & URLF_SEMI)
+	  return (p);
+	goto boring;
       case 0:
       case '&':
 	return (p);
@@ -176,6 +175,7 @@ static const char *decode(dstr *d, const char *p, int eq)
 	}
       }
       default:
+      boring:
 	DPUTC(d, *p);
 	break;
     }
@@ -200,7 +200,7 @@ int url_dec(url_dctx *ctx, dstr *n, dstr *v)
   size_t l = n->len;
 
 again:
-  if ((p = decode(n, p, 1)) == 0 || *p == 0)
+  if ((p = decode(ctx, n, p, 1)) == 0 || *p == 0)
     return (0);
   if (*p != '=') {
     p++;
@@ -208,7 +208,7 @@ again:
     goto again;
   }
   p++;
-  if ((p = decode(v, p, 0)) == 0)
+  if ((p = decode(ctx, v, p, 0)) == 0)
     return (0);
   DPUTZ(n);
   DPUTZ(v);