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/* missing.c */
/*$Log: missing.c,v $
* Revision 1.2 1995/06/03 09:31:11 mike
* handle strchr(s,0) correctly
*
**/
#include "nstd.h"
#ifdef NO_STRCHR
char *
strchr(s, c)
char *s ;
int c ;
{
if( c == 0 ) return s + strlen(s) ;
while (*s)
{
if (*s == c) return s ;
s++ ;
}
return (char *) 0 ;
}
char *
strrchr(s, c)
char *s ;
int c ;
{
char *ret = (char *) 0 ;
if ( c == 0 ) return s + strlen(s) ;
while (*s)
{
if (*s == c) ret = s ;
s++ ;
}
return ret ;
}
#endif /* NO_STRCHR */
#ifdef NO_STRERROR
extern int sys_nerr ;
extern char *sys_errlist[] ;
char *
strerror(n)
int n ;
{
return n > 0 & n < sys_nerr ? sys_errlist[n] : "" ;
}
#endif
#ifdef NO_MEMCPY
PTR
memcpy(t, s, n)
PTR t, s ;
size_t n ;
{
char *tt = t ;
char *ss = s ;
while (n > 0)
{
n-- ;
*tt++ = *ss++ ;
}
return t ;
}
int
memcmp(t, s, n)
PTR t, s ;
size_t n ;
{
char *tt = t ;
char *ss = s ;
while (n > 0)
{
if (*tt < *ss) return -1 ;
if (*tt > *ss) return 1 ;
tt++ ; ss++ ; n-- ;
}
return 0 ;
}
PTR
memset(t, c, n)
PTR t ;
int c ;
size_t n ;
{
char *tt = (char *) t ;
while (n > 0)
{
n-- ;
*tt++ = c ;
}
return t ;
}
#endif /* NO_MEMCPY */
#ifdef NO_STRTOD
/* don't use this unless you really don't have strtod() because
(1) its probably slower than your real strtod()
(2) atof() may call the real strtod()
*/
double
strtod(s, endptr)
const char *s ;
char **endptr ;
{
register unsigned char *p ;
int flag ;
double atof();
if (endptr)
{
p = (unsigned char *) s ;
flag = 0 ;
while (*p == ' ' || *p == '\t') p++ ;
if (*p == '-' || *p == '+') p++ ;
while ( scan_code[*p] == SC_DIGIT ) { flag++ ; p++ ; }
if (*p == '.')
{
p++ ;
while ( scan_code[*p] == SC_DIGIT ) { flag++ ; p++ ; }
}
/* done with number part */
if (flag == 0)
{ /* no number part */
*endptr = s ; return 0.0 ;
}
else *endptr = (char *) p ;
/* now look for exponent */
if (*p == 'e' || *p == 'E')
{
flag = 0 ;
p++ ;
if (*p == '-' || *p == '+') p++ ;
while ( scan_code[*p] == SC_DIGIT ) { flag++ ; p++ ; }
if (flag) *endptr = (char *) p ;
}
}
return atof(s) ;
}
#endif /* no strtod() */
#ifdef NO_FMOD
#ifdef SW_FP_CHECK /* this is V7 and XNX23A specific */
double
fmod(x, y)
double x, y;
{
double modf();
double dtmp, ipart;
clrerr() ;
dtmp = x / y ;
fpcheck() ;
modf(dtmp, &ipart) ;
return x - ipart * y ;
}
#else
double
fmod(x, y)
double x, y;
{
double modf();
double ipart;
modf(x / y, &ipart) ;
return x - ipart * y ;
}
#endif
#endif /* NO_FMOD */
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