diff options
Diffstat (limited to 'shell/math.c')
| -rw-r--r-- | shell/math.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/shell/math.c b/shell/math.c index 611b3be..2ea0317 100644 --- a/shell/math.c +++ b/shell/math.c @@ -513,6 +513,42 @@ static const char op_tokens[] ALIGN1 = { }; #define ptr_to_rparen (&op_tokens[sizeof(op_tokens)-7]) +#if ENABLE_FEATURE_SH_MATH_BASE +static arith_t strto_arith_t(const char *nptr, char **endptr) +{ + unsigned base; + arith_t n; + +# if ENABLE_FEATURE_SH_MATH_64 + n = strtoull(nptr, endptr, 0); +# else + n = strtoul(nptr, endptr, 0); +# endif + if (**endptr != '#' + || (*nptr < '1' || *nptr > '9') + || (n < 2 || n > 64) + ) { + return n; + } + + /* It's "N#nnnn" or "NN#nnnn" syntax, NN can't start with 0, + * NN is in 2..64 range. + */ + base = (unsigned)n; + n = 0; + nptr = *endptr + 1; + /* bash allows "N#" (empty "nnnn" part) */ + while (isdigit(*nptr)) { + /* bash does not check for overflows */ + n = n * base + (*nptr++ - '0'); + } + *endptr = (char*)nptr; + return n; +} +#define strto_arith_t(nptr, endptr, base_is_always_0) \ + strto_arith_t(nptr, endptr) +#endif + static arith_t FAST_FUNC evaluate_string(arith_state_t *math_state, const char *expr) { |