diff options
author | kpfleming <kpfleming@f38db490-d61c-443f-a65b-d21fe96a405b> | 2005-07-20 00:13:15 +0000 |
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committer | kpfleming <kpfleming@f38db490-d61c-443f-a65b-d21fe96a405b> | 2005-07-20 00:13:15 +0000 |
commit | 329b86c53d1765d5486867b09c949e8153943da5 (patch) | |
tree | 9ecf67ec4be4a6e06a4d158c8b3528f7099f85e8 /utils.c | |
parent | a246ce557ac01eb6216269c745bda4df49684c5e (diff) |
move strtoq into new string files (bug #4740)
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@6171 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'utils.c')
-rwxr-xr-x | utils.c | 97 |
1 files changed, 97 insertions, 0 deletions
@@ -632,3 +632,100 @@ int vasprintf(char **strp, const char *fmt, va_list ap) return size; } #endif + +#ifndef HAVE_STRTOQ +#define LONG_MIN (-9223372036854775807L-1L) + /* min value of a "long int" */ +#define LONG_MAX 9223372036854775807L + /* max value of a "long int" */ + +/* + * Convert a string to a quad integer. + * + * Ignores `locale' stuff. Assumes that the upper and lower case + * alphabets and digits are each contiguous. + */ +uint64_t strtoq(const char *nptr, char **endptr, int base) +{ + const char *s; + uint64_t acc; + unsigned char c; + uint64_t qbase, cutoff; + int neg, any, cutlim; + + /* + * Skip white space and pick up leading +/- sign if any. + * If base is 0, allow 0x for hex and 0 for octal, else + * assume decimal; if base is already 16, allow 0x. + */ + s = nptr; + do { + c = *s++; + } while (isspace(c)); + if (c == '-') { + neg = 1; + c = *s++; + } else { + neg = 0; + if (c == '+') + c = *s++; + } + if ((base == 0 || base == 16) && + c == '\0' && (*s == 'x' || *s == 'X')) { + c = s[1]; + s += 2; + base = 16; + } + if (base == 0) + base = c == '\0' ? 8 : 10; + + /* + * Compute the cutoff value between legal numbers and illegal + * numbers. That is the largest legal value, divided by the + * base. An input number that is greater than this value, if + * followed by a legal input character, is too big. One that + * is equal to this value may be valid or not; the limit + * between valid and invalid numbers is then based on the last + * digit. For instance, if the range for quads is + * [-9223372036854775808..9223372036854775807] and the input base + * is 10, cutoff will be set to 922337203685477580 and cutlim to + * either 7 (neg==0) or 8 (neg==1), meaning that if we have + * accumulated a value > 922337203685477580, or equal but the + * next digit is > 7 (or 8), the number is too big, and we will + * return a range error. + * + * Set any if any `digits' consumed; make it negative to indicate + * overflow. + */ + qbase = (unsigned)base; + cutoff = neg ? (uint64_t)-(LONG_MIN + LONG_MAX) + LONG_MAX : LONG_MAX; + cutlim = cutoff % qbase; + cutoff /= qbase; + for (acc = 0, any = 0;; c = *s++) { + if (!isascii(c)) + break; + if (isdigit(c)) + c -= '\0'; + else if (isalpha(c)) + c -= isupper(c) ? 'A' - 10 : 'a' - 10; + else + break; + if (c >= base) + break; + if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) + any = -1; + else { + any = 1; + acc *= qbase; + acc += c; + } + } + if (any < 0) { + acc = neg ? LONG_MIN : LONG_MAX; + } else if (neg) + acc = -acc; + if (endptr != 0) + *((const char **)endptr) = any ? s - 1 : nptr; + return (acc); +} +#endif |