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Diffstat (limited to 'Utilities/cmcurl/strtoofft.c')
| -rw-r--r-- | Utilities/cmcurl/strtoofft.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/Utilities/cmcurl/strtoofft.c b/Utilities/cmcurl/strtoofft.c new file mode 100644 index 000000000..3ab1bfdff --- /dev/null +++ b/Utilities/cmcurl/strtoofft.c @@ -0,0 +1,165 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2006, Daniel Stenberg, <daniel@haxx.se>, et al. + * + * This software is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at http://curl.haxx.se/docs/copyright.html. + * + * You may opt to use, copy, modify, merge, publish, distribute and/or sell + * copies of the Software, and permit persons to whom the Software is + * furnished to do so, under the terms of the COPYING file. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + * $Id$ + ***************************************************************************/ + +#include "setup.h" +#include "strtoofft.h" + +/* + * NOTE: + * + * In the ISO C standard (IEEE Std 1003.1), there is a strtoimax() function we + * could use in case strtoll() doesn't exist... See + * http://www.opengroup.org/onlinepubs/009695399/functions/strtoimax.html + */ + +#ifdef NEED_CURL_STRTOLL +#include <stdlib.h> +#include <ctype.h> +#include <errno.h> + +static int get_char(char c, int base); + +/** + * Emulated version of the strtoll function. This extracts a long long + * value from the given input string and returns it. + */ +curl_off_t +curlx_strtoll(const char *nptr, char **endptr, int base) +{ + char *end; + int is_negative = 0; + int overflow; + int i; + curl_off_t value = 0; + curl_off_t newval; + + /* Skip leading whitespace. */ + end = (char *)nptr; + while (ISSPACE(end[0])) { + end++; + } + + /* Handle the sign, if any. */ + if (end[0] == '-') { + is_negative = 1; + end++; + } + else if (end[0] == '+') { + end++; + } + else if (end[0] == '\0') { + /* We had nothing but perhaps some whitespace -- there was no number. */ + if (endptr) { + *endptr = end; + } + return 0; + } + + /* Handle special beginnings, if present and allowed. */ + if (end[0] == '0' && end[1] == 'x') { + if (base == 16 || base == 0) { + end += 2; + base = 16; + } + } + else if (end[0] == '0') { + if (base == 8 || base == 0) { + end++; + base = 8; + } + } + + /* Matching strtol, if the base is 0 and it doesn't look like + * the number is octal or hex, we assume it's base 10. + */ + if (base == 0) { + base = 10; + } + + /* Loop handling digits. */ + value = 0; + overflow = 0; + for (i = get_char(end[0], base); + i != -1; + end++, i = get_char(end[0], base)) { + newval = base * value + i; + if (newval < value) { + /* We've overflowed. */ + overflow = 1; + break; + } + else + value = newval; + } + + if (!overflow) { + if (is_negative) { + /* Fix the sign. */ + value *= -1; + } + } + else { + if (is_negative) + value = CURL_LLONG_MIN; + else + value = CURL_LLONG_MAX; + + errno = ERANGE; + } + + if (endptr) + *endptr = end; + + return value; +} + +/** + * Returns the value of c in the given base, or -1 if c cannot + * be interpreted properly in that base (i.e., is out of range, + * is a null, etc.). + * + * @param c the character to interpret according to base + * @param base the base in which to interpret c + * + * @return the value of c in base, or -1 if c isn't in range + */ +static int get_char(char c, int base) +{ + int value = -1; + if (c <= '9' && c >= '0') { + value = c - '0'; + } + else if (c <= 'Z' && c >= 'A') { + value = c - 'A' + 10; + } + else if (c <= 'z' && c >= 'a') { + value = c - 'a' + 10; + } + + if (value >= base) { + value = -1; + } + + return value; +} +#endif /* Only present if we need strtoll, but don't have it. */ |