| 27,7 → 27,11 |
|---|
| */ |
| |
| #include <string.h> |
| #include <unistd.h> |
| #include <ctype.h> |
| #include <limits.h> |
| |
| |
| /* Dummy implementation of mem/ functions */ |
| |
| void * memset(void *s, int c, size_t n) |
| 47,6 → 51,10 |
|---|
| return dest; |
| } |
| |
| /** Count the number of characters in the string, not including terminating 0. |
| * @param str string |
| * @return number of characters in string. |
| */ |
| size_t strlen(const char *str) |
| { |
| size_t counter = 0; |
| 57,3 → 65,172 |
|---|
| |
| return counter; |
| } |
| |
| /** Return pointer to the first occurence of character c in string |
| * @param str scanned string |
| * @param c searched character (taken as one byte) |
| * @return pointer to the matched character or NULL if it is not found in given string. |
| */ |
| char *strchr(const char *str, int c) |
| { |
| while (*str != '\0') { |
| if (*str == (char)c) |
| return (char *)str; |
| str++; |
| } |
| |
| return NULL; |
| } |
| |
| /** Return pointer to the last occurence of character c in string |
| * @param str scanned string |
| * @param c searched character (taken as one byte) |
| * @return pointer to the matched character or NULL if it is not found in given string. |
| */ |
| char *strrchr(const char *str, int c) |
| { |
| char *retval = NULL; |
| |
| while (*str != '\0') { |
| if (*str == (char)c) |
| retval = (char *)str; |
| str++; |
| } |
| |
| return (char *)retval; |
| } |
| |
| /** Convert string to a number. |
| * Core of strtol and strtoul functions. |
| * @param nptr pointer to string |
| * @param endptr if not NULL, function stores here pointer to the first invalid character |
| * @param base zero or number between 2 and 36 inclusive |
| * @param sgn its set to 1 if minus found |
| * @return result of conversion. |
| */ |
| static unsigned long _strtoul(const char *nptr, char **endptr, int base, char *sgn) |
| { |
| unsigned char c; |
| unsigned long result = 0; |
| unsigned long a, b; |
| const char *str = nptr; |
| const char *tmpptr; |
| |
| while (isspace(*str)) |
| str++; |
| |
| if (*str == '-') { |
| *sgn = 1; |
| ++str; |
| } else if (*str == '+') |
| ++str; |
| |
| if (base) { |
| if ((base == 1) || (base > 36)) { |
| /* FIXME: set errno to EINVAL */ |
| return 0; |
| } |
| if ((base == 16) && (*str == '0') && ((str[1] == 'x') || (str[1] == 'X'))) { |
| str += 2; |
| } |
| } else { |
| base = 10; |
| |
| if (*str == '0') { |
| base = 8; |
| if ((str[1] == 'X') || (str[1] == 'x')) { |
| base = 16; |
| str += 2; |
| } |
| } |
| } |
| |
| tmpptr = str; |
| |
| while (*str) { |
| c = *str; |
| c = ( c >= 'a'? c-'a'+10:(c >= 'A'?c-'A'+10:(c <= '9'?c-'0':0xff))); |
| if (c > base) { |
| break; |
| } |
| |
| a = (result & 0xff) * base + c; |
| b = (result >> 8) * base + (a >> 8); |
| |
| if (b > (ULONG_MAX >> 8)) { |
| /* overflow */ |
| /* FIXME: errno = ERANGE*/ |
| return ULONG_MAX; |
| } |
| |
| result = (b << 8) + (a & 0xff); |
| ++str; |
| } |
| |
| if (str == tmpptr) { |
| /* no number was found => first invalid character is the first character of the string */ |
| /* FIXME: set errno to EINVAL */ |
| str = nptr; |
| result = 0; |
| } |
| |
| if (endptr) |
| *endptr = (char *)str; |
| |
| if (nptr == str) { |
| /*FIXME: errno = EINVAL*/ |
| return 0; |
| } |
| |
| return result; |
| } |
| |
| /** Convert initial part of string to long int according to given base. |
| * The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-'). |
| * If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one. |
| * If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8). |
| * Otherwise the base 0 is taken as decimal. |
| * @param nptr pointer to string |
| * @param endptr if not NULL, function stores here pointer to the first invalid character |
| * @param base zero or number between 2 and 36 inclusive |
| * @return result of conversion. |
| */ |
| long int strtol(const char *nptr, char **endptr, int base) |
| { |
| char sgn = 0; |
| unsigned long number = 0; |
| |
| number = _strtoul(nptr, endptr, base, &sgn); |
| |
| if (number > LONG_MAX) { |
| if ((sgn) && (number == (unsigned long)(LONG_MAX) + 1)) { |
| /* FIXME: set 0 to errno */ |
| return number; |
| } |
| /* FIXME: set ERANGE to errno */ |
| return (sgn?LONG_MIN:LONG_MAX); |
| } |
| |
| return (sgn?-number:number); |
| } |
| |
| |
| /** Convert initial part of string to unsigned long according to given base. |
| * The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-'). |
| * If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one. |
| * If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8). |
| * Otherwise the base 0 is taken as decimal. |
| * @param nptr pointer to string |
| * @param endptr if not NULL, function stores here pointer to the first invalid character |
| * @param base zero or number between 2 and 36 inclusive |
| * @return result of conversion. |
| */ |
| unsigned long strtoul(const char *nptr, char **endptr, int base) |
| { |
| char sgn = 0; |
| unsigned long number = 0; |
| |
| number = _strtoul(nptr, endptr, base, &sgn); |
| |
| return (sgn?-number:number); |
| } |