diff options
Diffstat (limited to 'src/microhttpd/mhd_str.c')
| -rw-r--r-- | src/microhttpd/mhd_str.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/microhttpd/mhd_str.c b/src/microhttpd/mhd_str.c index bf9101ff..f54b45ed 100644 --- a/src/microhttpd/mhd_str.c +++ b/src/microhttpd/mhd_str.c @@ -84,6 +84,19 @@ isasciidigit (char c) } /** + * Check whether character is hexadecimal digit in US-ASCII + * @param c character to check + * @return non-zero if character is decimal digit, zero otherwise + */ +_MHD_inline _MHD_bool +isasciixdigit (char c) +{ + return isasciidigit (c) || + (c >= 'A' && c <= 'F') || + (c >= 'a' && c <= 'f'); +} + +/** * Check whether character is decimal digit or letter in US-ASCII * @param c character to check * @return non-zero if character is decimal digit or letter, zero otherwise @@ -122,6 +135,23 @@ toasciiupper (char c) return isasciilower (c) ? (c - 'a' + 'A') : c; } +/** + * Convert US-ASCII hexadecimal digit to its value. + * @param c character to convert + * @return value of hexadecimal digit or -1 if @ c is not hexadecimal digit + */ +_MHD_inline int +toxdigitvalue (char c) +{ + if (isasciidigit (c)) + return (unsigned char)(c - '0'); + if (c >= 'A' && c <= 'F') + return (unsigned char)(c - 'A' + 10); + if (c >= 'a' && c <= 'f') + return (unsigned char)(c - 'a' + 10); + + return -1; +} #else /* !INLINE_FUNC */ /** @@ -157,6 +187,16 @@ toasciiupper (char c) #define isasciidigit(c) (((char)(c)) >= '0' && ((char)(c)) <= '9') /** + * Check whether character is hexadecimal digit in US-ASCII + * @param c character to check + * @return boolean true if character is hexadecimal digit, + * boolean false otherwise + */ +#define isasciixdigit(c) (isasciidigit((c)) || \ + (((char)(c)) >= 'A' && ((char)(c)) <= 'F') || \ + (((char)(c)) >= 'a' && ((char)(c)) <= 'f') ) + +/** * Check whether character is decimal digit or letter in US-ASCII * @param c character to check * @return boolean true if character is decimal digit or letter, @@ -183,6 +223,17 @@ toasciiupper (char c) * @return converted to upper case character */ #define toasciiupper(c) ((isasciilower(c)) ? (((char)(c)) - 'a' + 'A') : ((char)(c))) + +/** + * Convert US-ASCII hexadecimal digit to its value. + * @param c character to convert + * @return value of hexadecimal digit or -1 if @ c is not hexadecimal digit + */ +#define toxdigitvalue(c) ( isasciidigit(c) ? (int)(((char)(c)) - '0') : \ + ( (((char)(c)) >= 'A' && ((char)(c)) <= 'F') ? \ + (int)(((unsigned char)(c)) - 'A' + 10) : \ + ( (((char)(c)) >= 'a' && ((char)(c)) <= 'f') ? \ + (int)(((unsigned char)(c)) - 'a' + 10) : (int)(-1) ))) #endif /* !INLINE_FUNC */ /** @@ -304,3 +355,85 @@ MHD_str_to_uint64_n_ (const char * str, size_t maxlen, uint64_t * out_val) *out_val= res; return i; } + + +/** + * Convert hexadecimal US-ASCII digits in string to number in size_t. + * Conversion stopped at first non-digit character. + * @param str string to convert + * @param out_val pointer to size_t to store result of conversion + * @return non-zero number of characters processed on succeed, + * zero if no digit is found, resulting value is larger + * then possible to store in size_t or @a out_val is NULL + */ +size_t +MHD_strx_to_sizet_ (const char * str, size_t * out_val) +{ + const char * const start = str; + size_t res; + int digit; + if (!str || !out_val) + return 0; + + res = 0; + digit = toxdigitvalue (*str); + while (digit >= 0) + { + if ( (res < (SIZE_MAX / 16)) || + (res == (SIZE_MAX / 16) && digit <= (SIZE_MAX % 16)) ) + { + res *= 16; + res += digit; + } + else + return 0; + str++; + digit = toxdigitvalue (*str); + } + + if (str - start > 0) + *out_val = res; + return str - start; +} + + +/** + * Convert not more then @a maxlen hexadecimal US-ASCII digits in string + * to number in size_t. + * Conversion stopped at first non-digit character or after @a maxlen + * digits. + * @param str string to convert + * @param maxlen maximum number of characters to process + * @param out_val pointer to size_t to store result of conversion + * @param next_char pointer to store pointer to character next to last + * converted digit, ignored if NULL + * @return non-zero number of characters processed on succeed, + * zero if no digit is found, resulting value is larger + * then possible to store in size_t or @a out_val is NULL + */ +size_t +MHD_strx_to_sizet_n_ (const char * str, size_t maxlen, size_t * out_val) +{ + size_t i; + size_t res; + int digit; + if (!str || !out_val) + return 0; + + res = 0; + i = 0; + while (i < maxlen && (digit = toxdigitvalue (str[i])) >= 0) + { + if ( (res > (SIZE_MAX / 16)) || + (res == (SIZE_MAX / 16) && digit > (SIZE_MAX % 16)) ) + return 0; + + res *= 16; + res += digit; + i++; + } + + if (i) + *out_val = res; + return i; +} |