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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [machine/] [powerpc/] [strtoufix32.c] - Rev 217
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#ifdef __SPE__ #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 32-bit value. * * Ignores `locale' stuff. */ __uint32_t _DEFUN (_strtoufix32_r, (rptr, nptr, endptr), struct _reent *rptr _AND _CONST char *nptr _AND char **endptr) { union double_union dbl; int exp, negexp; __uint32_t tmp, tmp2, result = 0; 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 ULONG_MAX; } /* check for normal saturation */ if (dbl.d >= 1.0) { rptr->_errno = ERANGE; return ULONG_MAX; } else if (dbl.d < 0) { rptr->_errno = ERANGE; return 0; } /* otherwise we have normal positive number in range */ /* strip off exponent */ exp = ((word0(dbl) & Exp_mask) >> Exp_shift) - Bias; negexp = -exp; if (negexp > 32) return 0; word0(dbl) &= ~(Exp_mask | Sign_bit); /* add in implicit normalized bit */ word0(dbl) |= Exp_msk1; /* shift so result is contained left-justified in word */ tmp = word0(dbl) << Ebits; tmp |= ((unsigned long)word1(dbl) >> (32 - Ebits)); /* perform rounding */ if (negexp > 1) { tmp2 = tmp + (1 << (negexp - 2)); result = (tmp2 >> (negexp - 1)); /* if rounding causes carry, add carry bit in */ if (tmp2 < tmp) result += 1 << (32 - negexp); } else { result = tmp + ((word1(dbl) & (1 << (32 - Ebits - 1))) != 0); /* if rounding causes carry, then saturation has occurred */ if (result < tmp) { rptr->_errno = ERANGE; return ULONG_MAX; } } return result; } #ifndef _REENT_ONLY __uint32_t _DEFUN (strtoufix32, (s, ptr, base), _CONST char *s _AND char **ptr) { return _strtoufix32_r (_REENT, s, ptr); } #endif #endif /* __SPE__ */
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