Make tokenize work with a const char pointer.

libc/inc/string.h

@@ -177,7 +177,7 @@ char *strtok_r(char *str, const char *delim, char **saveptr);
 /// @param buffer the buffer where we save the parsed token.
 /// @param buflen the length of the buffer.
 /// @return 1 if we still have things to parse, 0 if we finished parsing.
-int tokenize(char *string, char *separators, size_t *offset, char *buffer, ssize_t buflen);
+int tokenize(const char *string, char *separators, size_t *offset, char *buffer, ssize_t buflen);
 
 /// @brief Copies the values of num bytes from the location pointed by source
 /// to the memory block pointed by destination.

libc/src/string.c

@@ -218,7 +218,7 @@ char *strpbrk(const char *string, const char *control)
     return NULL;
 }
 
-int tokenize(char *string, char *separators, size_t *offset, char *buffer, ssize_t buflen)
+int tokenize(const char *string, char *separators, size_t *offset, char *buffer, ssize_t buflen)
 {
     // If we reached the end of the parsed string, stop.
     if (string[*offset] == 0) {

mentos/src/klib/string.c

@@ -218,7 +218,7 @@ char *strpbrk(const char *string, const char *control)
     return NULL;
 }
 
-int tokenize(char *string, char *separators, size_t *offset, char *buffer, ssize_t buflen)
+int tokenize(const char *string, char *separators, size_t *offset, char *buffer, ssize_t buflen)
 {
     // If we reached the end of the parsed string, stop.
     if (string[*offset] == 0) {