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-rw-r--r--cqrlogo.c40
1 files changed, 27 insertions, 13 deletions
diff --git a/cqrlogo.c b/cqrlogo.c
index d91b8fb..74799bf 100644
--- a/cqrlogo.c
+++ b/cqrlogo.c
@@ -163,6 +163,30 @@ struct bitmap_t * encode_qrcode (char *text, unsigned int scale, unsigned int bo
return scaled;
}
+/*** get_value ***/
+int get_value(const char *query_string, const char *pattern, unsigned int *value, unsigned int def, unsigned int min, unsigned int max) {
+ char *match = NULL, *newpattern = NULL;
+
+ newpattern = strdup(pattern);
+
+ newpattern = realloc(newpattern, strlen(newpattern) + 2);
+ sprintf(newpattern + strlen(newpattern), "=");
+
+ if ((match = strstr(query_string, newpattern)) != NULL) {
+ newpattern = realloc(newpattern, strlen(newpattern) + 3);
+ sprintf(newpattern + strlen(newpattern), "%%u");
+
+ if ((sscanf(match, newpattern, value)) > 0)
+ if (*value < min || *value > max)
+ *value = def;
+ }
+
+ free(newpattern);
+
+ return EXIT_SUCCESS;
+}
+
+/*** main ***/
int main(int argc, char **argv) {
char * http_referer, * server_name, * pattern;
regex_t preg;
@@ -170,7 +194,6 @@ int main(int argc, char **argv) {
int referer = 0;
struct bitmap_t * bitmap;
- char *match = NULL;
unsigned int scale = QRCODE_SCALE, border = QRCODE_BORDER, level = QRCODE_LEVEL;
/* get query string for later use */
@@ -206,22 +229,13 @@ int main(int argc, char **argv) {
if (query_string ) {
/* do we have a special scale? */
- if ((match = strstr(query_string, "scale=")) != NULL)
- if ((sscanf(match, "scale=%u", &scale)) > 0)
- if (scale < 1 || scale > QRCODE_MAX_SCALE)
- scale = QRCODE_SCALE;
+ get_value(query_string, "scale", &scale, QRCODE_SCALE, 1, QRCODE_MAX_SCALE);
/* width of the border? */
- if ((match = strstr(query_string, "border=")) != NULL)
- if ((sscanf(match, "border=%u", &border)) > 0)
- if (border > QRCODE_MAX_BORDER)
- border = QRCODE_BORDER;
+ get_value(query_string, "border", &border, QRCODE_BORDER, 0, QRCODE_MAX_BORDER);
/* error correction level? */
- if ((match = strstr(query_string, "level=")) != NULL)
- if ((sscanf(match, "level=%u", &level)) > 0)
- if (level > QR_ECLEVEL_H)
- level = QRCODE_LEVEL;
+ get_value(query_string, "level", &level, QRCODE_LEVEL, 0, QR_ECLEVEL_H);
}
if ((bitmap = encode_qrcode(http_referer, scale, border, level)) == NULL) {