Added function for detection of token inside comma-separated string, added tests

src/microhttpd/Makefile.am

@@ -142,6 +142,7 @@ endif
 check_PROGRAMS = \
   test_str_compare \
   test_str_to_value \
+  test_str_token \
   test_http_reasons \
   test_shutdown_select \
   test_shutdown_poll \
@@ -251,6 +252,9 @@ test_str_compare_SOURCES = \
 test_str_to_value_SOURCES = \
   test_str.c test_helpers.h mhd_str.c
 
+test_str_token_SOURCES = \
+  test_str_token.c mhd_str.c
+
 test_http_reasons_SOURCES = \
   test_http_reasons.c \
   reason_phrase.c mhd_str.c mhd_str.h

src/microhttpd/internal.h

@@ -117,10 +117,13 @@ extern void *mhd_panic_cls;
 #define BUILTIN_NOT_REACHED
 #endif
 
+#ifndef MHD_STATICSTR_LEN_
 /**
  * Determine length of static string / macro strings at compile time.
  */
 #define MHD_STATICSTR_LEN_(macro) (sizeof(macro)/sizeof(char) - 1)
+#endif /* ! MHD_STATICSTR_LEN_ */
+
 
 /**
  * State of the socket with respect to epoll (bitmask).

src/microhttpd/mhd_str.c

@@ -365,6 +365,64 @@ MHD_str_equal_caseless_n_ (const char * const str1,
   return !0;
 }
 
+
+/**
+ * Check whether @a str has case-insensitive @a token.
+ * Token could be surrounded by spaces and tabs and delimited by comma.
+ * Match succeed if substring between start, end (of string) or comma
+ * contains only case-insensitive token and optional spaces and tabs.
+ * @warning token must not contain null-charters except optional
+ *          terminating null-character.
+ * @param str the string to check
+ * @param token the token to find
+ * @param token_len length of token, not including optional terminating
+ *                  null-character.
+ * @return non-zero if two strings are equal, zero otherwise.
+ */
+bool
+MHD_str_has_token_caseless_ (const char * str,
+                             const char * const token,
+                             size_t token_len)
+{
+  if (0 == token_len)
+    return false;
+
+  while (0 != *str)
+    {
+      size_t i;
+      /* Skip all whitespaces and empty tokens. */
+      while (' ' == *str || '\t' == *str || ',' == *str) str++;
+
+      /* Check for token match. */
+      i = 0;
+      while (1)
+        {
+          const char sc = *(str++);
+          const char tc = token[i++];
+
+          if (0 == sc)
+            return false;
+          if ( (sc != tc) &&
+               (toasciilower (sc) != toasciilower (tc)) )
+            break;
+          if (i >= token_len)
+            {
+              /* Check whether substring match token fully or
+               * has additional unmatched chars at tail. */
+              while (' ' == *str || '\t' == *str) str++;
+              /* End of (sub)string? */
+              if (0 == *str || ',' == *str)
+                return true;
+              /* Unmatched chars at end of substring. */
+              break;
+            }
+        }
+       /* Find next substring. */
+      while (0 != *str && ',' != *str) str++;
+    }
+  return false;
+}
+
 #ifndef MHD_FAVOR_SMALL_CODE
 /* Use individual function for each case */
 

src/microhttpd/mhd_str.h

@@ -30,11 +30,21 @@
 
 #include <stdint.h>
 #include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+#include <stdbool.h>
+#endif /* HAVE_STDBOOL_H */
 
 #ifdef MHD_FAVOR_SMALL_CODE
 #include "mhd_limits.h"
 #endif /* MHD_FAVOR_SMALL_CODE */
 
+#ifndef MHD_STATICSTR_LEN_
+/**
+ * Determine length of static string / macro strings at compile time.
+ */
+#define MHD_STATICSTR_LEN_(macro) (sizeof(macro)/sizeof(char) - 1)
+#endif /* ! MHD_STATICSTR_LEN_ */
+
 /*
  * Block of functions/macros that use US-ASCII charset as required by HTTP
  * standards. Not affected by current locale settings.
@@ -71,6 +81,38 @@ MHD_str_equal_caseless_n_ (const char * const str1,
                   const char * const str2,
                   size_t maxlen);
 
+
+/**
+ * Check whether @a str has case-insensitive @a token.
+ * Token could be surrounded by spaces and tabs and delimited by comma.
+ * Match succeed if substring between start, end of string or comma
+ * contains only case-insensitive token and optional spaces and tabs.
+ * @warning token must not contain null-charters except optional
+ *          terminating null-character.
+ * @param str the string to check
+ * @param token the token to find
+ * @param token_len length of token, not including optional terminating
+ *                  null-character.
+ * @return non-zero if two strings are equal, zero otherwise.
+ */
+bool
+MHD_str_has_token_caseless_ (const char * str,
+                             const char * const token,
+                             size_t token_len);
+
+/**
+ * Check whether @a str has case-insensitive static @a tkn.
+ * Token could be surrounded by spaces and tabs and delimited by comma.
+ * Match succeed if substring between start, end of string or comma
+ * contains only case-insensitive token and optional spaces and tabs.
+ * @warning tkn must be static string
+ * @param str the string to check
+ * @param tkn the static string of token to find
+ * @return non-zero if two strings are equal, zero otherwise.
+ */
+#define MHD_str_has_s_token_caseless_(str,tkn) \
+    MHD_str_has_token_caseless_((str),(tkn),MHD_STATICSTR_LEN_(tkn))
+
 #ifndef MHD_FAVOR_SMALL_CODE
 /* Use individual function for each case to improve speed */