Move cgit_parse_query() from parsing.c to html.c as http_parse_querystring()

This is a generic http-function.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/html.c b/html.c
index 0962e71..98ffaf9 100644
--- a/html.c
+++ b/html.c
@@ -185,3 +185,67 @@ int html_include(const char *filename)
         fclose(f);
         return 0;
 }
+
+int hextoint(char c)
+{
+        if (c >= 'a' && c <= 'f')
+                return 10 + c - 'a';
+        else if (c >= 'A' && c <= 'F')
+                return 10 + c - 'A';
+        else if (c >= '0' && c <= '9')
+                return c - '0';
+        else
+                return -1;
+}
+
+char *convert_query_hexchar(char *txt)
+{
+        int d1, d2;
+        if (strlen(txt) < 3) {
+                *txt = '\0';
+                return txt-1;
+        }
+        d1 = hextoint(*(txt+1));
+        d2 = hextoint(*(txt+2));
+        if (d1<0 || d2<0) {
+                strcpy(txt, txt+3);
+                return txt-1;
+        } else {
+                *txt = d1 * 16 + d2;
+                strcpy(txt+1, txt+3);
+                return txt;
+        }
+}
+
+int http_parse_querystring(char *txt, void (*fn)(const char *name, const char *value))
+{
+        char *t, *value = NULL, c;
+
+        if (!txt)
+                return 0;
+
+        t = txt = strdup(txt);
+        if (t == NULL) {
+                printf("Out of memory\n");
+                exit(1);
+        }
+        while((c=*t) != '\0') {
+                if (c=='=') {
+                        *t = '\0';
+                        value = t+1;
+                } else if (c=='+') {
+                        *t = ' ';
+                } else if (c=='%') {
+                        t = convert_query_hexchar(t);
+                } else if (c=='&') {
+                        *t = '\0';
+                        (*fn)(txt, value);
+                        txt = t+1;
+                        value = NULL;
+                }
+                t++;
+        }
+        if (t!=txt)
+                (*fn)(txt, value);
+        return 0;
+}