[binutils.git] / libiberty / strncmp.c

/* strncmp -- compare two strings, stop after n bytes.
   This function is in the public domain.  */

/*

@deftypefn Supplemental int strncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n})

Compares the first @var{n} bytes of two strings, returning a value as
@code{strcmp}.

@end deftypefn

*/

#include <ansidecl.h>
#ifdef ANSI_PROTOTYPES
#include <stddef.h>
#else
#define size_t unsigned long
#endif

int
strncmp(s1, s2, n)
     const char *s1, *s2;
     register size_t n;
{
  register unsigned char u1, u2;

  while (n-- > 0)
    {
      u1 = (unsigned char) *s1++;
      u2 = (unsigned char) *s2++;
      if (u1 != u2)
	return u1 - u2;
      if (u1 == '\0')
	return 0;
    }
  return 0;
}
Commit	Line	Data
eb383413 L	1	/* strncmp -- compare two strings, stop after n bytes.
	2	This function is in the public domain. */
	3
39423523 DD	4	/*
	5
	6	@deftypefn Supplemental int strncmp (const char @var{s1}, const char @var{s2}, size_t @var{n})
	7
	8	Compares the first @var{n} bytes of two strings, returning a value as
	9	@code{strcmp}.
	10
	11	@end deftypefn
	12
	13	*/
	14
eb383413	15	#include <ansidecl.h>
7ec2fc6f	16	#ifdef ANSI_PROTOTYPES
eb383413 L	17	#include <stddef.h>
	18	#else
	19	#define size_t unsigned long
	20	#endif
	21
	22	int
	23	strncmp(s1, s2, n)
	24	const char s1, s2;
	25	register size_t n;
	26	{
	27	register unsigned char u1, u2;
	28
	29	while (n-- > 0)
	30	{
	31	u1 = (unsigned char) *s1++;
	32	u2 = (unsigned char) *s2++;
	33	if (u1 != u2)
	34	return u1 - u2;
	35	if (u1 == '\0')
	36	return 0;
	37	}
	38	return 0;
	39	}