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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [powerpc/] [strtosfix32.c] - Rev 859
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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 (sign + 31-bits) value. * * Ignores `locale' stuff. */ __int32_t _DEFUN (_strtosfix32_r, (rptr, nptr, endptr), struct _reent *rptr _AND _CONST char *nptr _AND char **endptr) { union double_union dbl; int exp, negexp, sign; unsigned long tmp, tmp2; long 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 LONG_MIN; return LONG_MAX; } /* check for normal saturation */ if (dbl.d >= 1.0) { rptr->_errno = ERANGE; return LONG_MAX; } else if (dbl.d < -1.0) { rptr->_errno = ERANGE; return LONG_MIN; } /* otherwise we have normal number in range */ /* strip off sign and exponent */ sign = word0(dbl) & Sign_bit; exp = ((word0(dbl) & Exp_mask) >> Exp_shift) - Bias; negexp = -exp; if (negexp > 31) return 0; word0(dbl) &= ~(Exp_mask | Sign_bit); /* add in implicit normalized bit */ word0(dbl) |= Exp_msk1; /* shift so result is contained in single word */ tmp = word0(dbl) << Ebits; tmp |= ((unsigned long)word1(dbl) >> (32 - Ebits)); if (negexp != 0) { /* perform rounding */ tmp2 = tmp + (1 << (negexp - 1)); result = (long)(tmp2 >> negexp); /* check if rounding caused carry bit which must be added into result */ if (tmp2 < tmp) result |= (1 << (32 - negexp)); /* check if positive saturation has occurred because of rounding */ if (!sign && result < 0) { rptr->_errno = ERANGE; return LONG_MAX; } } else { /* we have -1.0, no rounding necessary */ return LONG_MIN; } return sign ? -result : result; } #ifndef _REENT_ONLY __int32_t _DEFUN (strtosfix32, (s, ptr, base), _CONST char *s _AND char **ptr) { return _strtosfix32_r (_REENT, s, ptr); } #endif #endif /* __SPE__ */
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