mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Yukihiro "Matz" Matsumoto
31 lines
847 B
C
31 lines
847 B
C
#include <mruby.h>
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#include <mruby/numeric.h>
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#include <errno.h>
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/* mrb_int_read(): read mrb_int from a string (base 10 only) */
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/* const char *p - string to read */
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/* const char *e - end of string */
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/* char **endp - end of parsed integer */
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/* if integer overflows, errno will be set to ERANGE */
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/* also endp will be set to NULL on overflow */
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MRB_API mrb_int
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mrb_int_read(const char *p, const char *e, char **endp)
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{
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mrb_int n = 0;
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int ch;
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while ((e == NULL || p < e) && ISDIGIT(*p)) {
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ch = *p - '0';
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if (mrb_int_mul_overflow(n, 10, &n) ||
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mrb_int_add_overflow(n, ch, &n)) {
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if (endp) *endp = NULL;
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errno = ERANGE;
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return MRB_INT_MAX;
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}
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p++;
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}
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if (endp) *endp = (char*)p;
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return n;
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}
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