49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
#ifndef __STDLIB_P_H__
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# define __STDLIB_P_H__
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#include <stdlib.h>
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#include <stdbool.h>
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/*
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** Parse an integer from a string. This is the base function for strtol,
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** strtoul, strtoll, and strtoull.
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**
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** This function does not set errno, and instead returns the error code
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** according to conversion rules. Setting errno is troublesome because it's a
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** global state that cannot be reverted and thus cannot be tested.
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**
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** If outl is non-NULL, strto_int produces a long or an unsigned long result
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** (depending on use_unsigned). Signedness only affects the range of values
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** that are considered to be ERANGE, and both results are stored in *outl.
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** Similarly, if outll is non-NULL, strto_int produces a long long or unsigned
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** long long result. Only one pointer should be non-NULL.
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**
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** On platforms where long is 32-bit, 64-bit operations are performed only if
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** outll is non-NULL. This is because multiplications with overflow can be
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** expensive.
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*/
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int __strto_int(
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char const * restrict __ptr,
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char ** restrict __endptr,
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int __base,
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long *__outl,
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long long *__outll,
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bool __use_unsigned);
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/*
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** Parse a floating-point value from a string. This is the base function for
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** strtod, strtof, and strtold.
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**
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** This function is similar to strto_int(). If returns the error code to set in
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** errno, and can produce one of three outputs depending on which of out, outf
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** and outl is set.
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*/
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int __strto_fp(
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char const * restrict __ptr,
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char ** restrict __endptr,
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double *__out,
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float *__outf,
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long double *__outl);
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#endif /*__STDLIB_P_H__*/
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