strtof.c File Reference

#include "c.h"
#include <float.h>
#include <math.h>

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Functions
float	strtof (const char *nptr, char **endptr)

Function Documentation

strtof()

float strtof	(	const char *	nptr,
		char **	endptr
	)

Definition at line 28 of file strtof.c.

Referenced by float4in().

{
    int         caller_errno = errno;
    double      dresult;
    float       fresult;

    errno = 0;
    dresult = strtod(nptr, endptr);
    fresult = (float) dresult;

    if (errno == 0)
    {
        /*
         * Value might be in-range for double but not float.
         */
        if (dresult != 0 && fresult == 0)
            caller_errno = ERANGE;  /* underflow */
        if (!isinf(dresult) && isinf(fresult))
            caller_errno = ERANGE;  /* overflow */
    }
    else
        caller_errno = errno;

    errno = caller_errno;
    return fresult;
}