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-rw-r--r--lib/strcase.c121
1 files changed, 97 insertions, 24 deletions
diff --git a/lib/strcase.c b/lib/strcase.c
index 14cbe4c54..22b9692e2 100644
--- a/lib/strcase.c
+++ b/lib/strcase.c
@@ -21,34 +21,100 @@
***************************************************************************/
#include "curl_setup.h"
+#include "strcase.h"
-#ifdef HAVE_STRINGS_H
-#include <strings.h>
+/* Portable, consistent toupper (remember EBCDIC). Do not use toupper() because
+ its behavior is altered by the current locale. */
+char Curl_raw_toupper(char in)
+{
+#if !defined(CURL_DOES_CONVERSIONS)
+ if(in >= 'a' && in <= 'z')
+ return (char)('A' + in - 'a');
+#else
+ switch (in) {
+ case 'a':
+ return 'A';
+ case 'b':
+ return 'B';
+ case 'c':
+ return 'C';
+ case 'd':
+ return 'D';
+ case 'e':
+ return 'E';
+ case 'f':
+ return 'F';
+ case 'g':
+ return 'G';
+ case 'h':
+ return 'H';
+ case 'i':
+ return 'I';
+ case 'j':
+ return 'J';
+ case 'k':
+ return 'K';
+ case 'l':
+ return 'L';
+ case 'm':
+ return 'M';
+ case 'n':
+ return 'N';
+ case 'o':
+ return 'O';
+ case 'p':
+ return 'P';
+ case 'q':
+ return 'Q';
+ case 'r':
+ return 'R';
+ case 's':
+ return 'S';
+ case 't':
+ return 'T';
+ case 'u':
+ return 'U';
+ case 'v':
+ return 'V';
+ case 'w':
+ return 'W';
+ case 'x':
+ return 'X';
+ case 'y':
+ return 'Y';
+ case 'z':
+ return 'Z';
+ }
#endif
-#include "strcase.h"
+ return in;
+}
/*
+ * Curl_raw_equal() is for doing "raw" case insensitive strings. This is meant
+ * to be locale independent and only compare strings we know are safe for
+ * this. See https://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for
+ * some further explanation to why this function is necessary.
+ *
+ * The function is capable of comparing a-z case insensitively even for
+ * non-ascii.
+ *
* @unittest: 1301
*/
+
int curl_strcasecompare(const char *first, const char *second)
{
-#if defined(HAVE_STRCASECMP)
- return !(strcasecmp)(first, second);
-#elif defined(HAVE_STRCMPI)
- return !(strcmpi)(first, second);
-#elif defined(HAVE_STRICMP)
- return !(stricmp)(first, second);
-#else
while(*first && *second) {
- if(toupper(*first) != toupper(*second)) {
+ if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
+ /* get out of the loop as soon as they don't match */
break;
- }
first++;
second++;
}
- return toupper(*first) == toupper(*second);
-#endif
+ /* we do the comparison here (possibly again), just to make sure that if the
+ loop above is skipped because one of the strings reached zero, we must not
+ return this as a successful match */
+ return (Curl_raw_toupper(*first) == Curl_raw_toupper(*second));
}
/*
@@ -56,15 +122,8 @@ int curl_strcasecompare(const char *first, const char *second)
*/
int curl_strncasecompare(const char *first, const char *second, size_t max)
{
-#if defined(HAVE_STRNCASECMP)
- return !strncasecmp(first, second, max);
-#elif defined(HAVE_STRNCMPI)
- return !strncmpi(first, second, max);
-#elif defined(HAVE_STRNICMP)
- return !strnicmp(first, second, max);
-#else
while(*first && *second && max) {
- if(toupper(*first) != toupper(*second)) {
+ if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second)) {
break;
}
max--;
@@ -74,6 +133,20 @@ int curl_strncasecompare(const char *first, const char *second, size_t max)
if(0 == max)
return 1; /* they are equal this far */
- return toupper(*first) == toupper(*second);
-#endif
+ return Curl_raw_toupper(*first) == Curl_raw_toupper(*second);
+}
+
+/* Copy an upper case version of the string from src to dest. The
+ * strings may overlap. No more than n characters of the string are copied
+ * (including any NUL) and the destination string will NOT be
+ * NUL-terminated if that limit is reached.
+ */
+void Curl_strntoupper(char *dest, const char *src, size_t n)
+{
+ if(n < 1)
+ return;
+
+ do {
+ *dest++ = Curl_raw_toupper(*src);
+ } while(*src++ && --n);
}