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Diffstat (limited to 'newlib/libc/machine/powerpc/strtoufix16.c')
| -rw-r--r-- | newlib/libc/machine/powerpc/strtoufix16.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/newlib/libc/machine/powerpc/strtoufix16.c b/newlib/libc/machine/powerpc/strtoufix16.c new file mode 100644 index 000000000..0c1fad30f --- /dev/null +++ b/newlib/libc/machine/powerpc/strtoufix16.c @@ -0,0 +1,197 @@ +/* +FUNCTION + <<strtoufix16>>, <<strtoufix32>>, <<strtoufix64>>---string to signed fixed point + +INDEX + strtoufix16 +INDEX + strtoufix32 +INDEX + strtoufix64 +INDEX + _strtoufix16_r +INDEX + _strtoufix32_r +INDEX + _strtoufix64_r + +ANSI_SYNOPSIS + #include <stdlib.h> + __uint16_t strtoufix16 (const char *<[s]>, char **<[ptr]>); + + __uint32_t strtoufix32 (const char *<[s]>, char **<[ptr]>); + + __uint64_t strtoufix64 (const char *<[s]>, char **<[ptr]>); + + __uint16_t _strtoufix16_r (void *<[reent]>, + const char *<[s]>, char **<[ptr]>); + + __uint32_t _strtoufix32_r (void *<[reent]>, + const char *<[s]>, char **<[ptr]>); + + __uint64_t _strtoufix64_r (void *<[reent]>, + const char *<[s]>, char **<[ptr]>); + +TRAD_SYNOPSIS + #include <stdlib.h> + __uint16_t strtoufix16 (<[s]>, <[ptr]>) + char *<[s]>; + char **<[ptr]>; + + __uint32_t strtoufix32 (<[s]>, <[ptr]>) + char *<[s]>; + char **<[ptr]>; + + __uint64_t strtoufix64 (<[s]>, <[ptr]>) + char *<[s]>; + char **<[ptr]>; + + __uint16_t _strtoufix16_r (<[reent]>, <[s]>, <[ptr]>) + char *<[reent]>; + char *<[s]>; + char **<[ptr]>; + + __uint32_t _strtoufix32_r (<[reent]>, <[s]>, <[ptr]>) + char *<[reent]>; + char *<[s]>; + char **<[ptr]>; + + __uint64_t _strtoufix64_r (<[reent]>, <[s]>, <[ptr]>) + char *<[reent]>; + char *<[s]>; + char **<[ptr]>; + +DESCRIPTION + The function <<strtoufix16>> converts the string <<*<[s]>>> to + a fixed-point 16-bits fraction representation. The function + follows the same rules as <<strtod>>. + + The substring converted is the longest initial + subsequence of <[s]>, beginning with the first + non-whitespace character, that has the format: + .[+|-]<[digits]>[.][<[digits]>][(e|E)[+|-]<[digits]>] + The substring contains no characters if <[s]> is empty, consists + entirely of whitespace, or if the first non-whitespace + character is something other than <<+>>, <<->>, <<.>>, or a + digit. If the substring is empty, no conversion is done, and + the value of <[s]> is stored in <<*<[ptr]>>>. Otherwise, + the substring is converted, and a pointer to the final string + (which will contain at least the terminating null character of + <[s]>) is stored in <<*<[ptr]>>>. If you want no + assignment to <<*<[ptr]>>>, pass a null pointer as <[ptr]>. + + <<strtoufix32>> is identical to <<strtoufix16>> except that it + converts to fixed-point 32-bit fraction representation. + <<strtoufix64>> is also similar, except that it converts + to fixed-point 64-bit fraction. + + The alternate functions <<_strtoufix16_r>>, <<_strtoufix32_r>>, + and <<_strtoufix64_r>> are reentrant versions. + The extra argument <[reent]> is a pointer to a reentrancy structure. + +RETURNS + The functions return the converted substring value, if any. If + no conversion can be performed, then 0 is returned. If the converted + value is a NaN, 0 is returned and errno is set to <<EDOM>>. + If the converted value exceeds the maximum positive unsigned fixed-point value, + the output value is saturated to the maximum value and <<ERANGE>> is stored in + errno. If the converted value is less than 0, then the output is saturated to 0 + and <<ERANGE>> is stored in errno. Otherwise, the converted value is returned in the + specified fixed-point format. + +PORTABILITY + <<strtoufix16>>, <<strtoufix32>>, and <<strtoufix64>> are non-standard. + + The OS subroutines of <<strtod>> are required. +*/ + +#include <_ansi.h> +#include <limits.h> +#include <errno.h> +#include <stdlib.h> +#include <reent.h> +#include "vfieeefp.h" + +/* + * Convert a string to a fixed-point 16-bit value. + * + * Ignores `locale' stuff. + */ +__uint16_t +_DEFUN (_strtoufix16_r, (rptr, nptr, endptr), + struct _reent *rptr _AND + _CONST char *nptr _AND + char **endptr) +{ + union double_union dbl; + unsigned long tmp, tmp2, result; + int exp, negexp; + + dbl.d = _strtod_r (rptr, nptr, endptr); + + /* treat NAN as domain error, +/- infinity as saturation */ + if (!finite(dbl.d)) + { + if (isnan (dbl.d)) + { + rptr->_errno = EDOM; + return 0; + } + rptr->_errno = ERANGE; + if (word0(dbl) & Sign_bit) + return 0; + return USHRT_MAX; + } + + /* check for normal saturation */ + if (dbl.d >= 1.0) + { + rptr->_errno = ERANGE; + return USHRT_MAX; + } + else if (dbl.d < 0) + { + rptr->_errno = ERANGE; + return 0; + } + + /* otherwise we have normal postive number in range */ + + /* strip off exponent */ + exp = ((word0(dbl) & Exp_mask) >> Exp_shift) - Bias; + negexp = -exp; + if (negexp > 16) + return 0; + /* add in implicit normalized bit */ + tmp = word0(dbl) | Exp_msk1; + /* remove exponent and sign */ + tmp <<= Ebits; + /* perform rounding */ + tmp2 = tmp + (1 << (negexp + 14)); + result = tmp2 >> (negexp + 15); + /* if rounding causes carry, must add carry bit in */ + if (tmp2 < tmp) + { + if (negexp == 0) + { + /* we have overflow which means saturation */ + rptr->_errno = ERANGE; + return USHRT_MAX; + } + result |= (1 << (16 - negexp)); + } + + return (__uint16_t)result; +} + +#ifndef _REENT_ONLY + +__uint16_t +_DEFUN (strtoufix16, (s, ptr, base), + _CONST char *s _AND + char **ptr) +{ + return _strtoufix16_r (_REENT, s, ptr); +} + +#endif |