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UNIX.C
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C/C++ Source or Header
|
1991-12-16
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6KB
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222 lines
/*--------------------------------*\
| Additions for UNIX-compatibility |
\*--------------------------------*/
#ifdef __unix__
/*#ifdef __vax__
char *strdup(s1)
char *s1;
{ char *s;
s = malloc(strlen(s1)+1);
strcpy(s,s1);
return(s);
}
#endif /* __vax */
static int first = 1;
int my_getch()
{ unsigned char c;
int fd;
fd = fileno (stdin);
if (first) {
first = 0;
#ifdef SYSV
(void) ioctl(fd, TCGETA, (char *) &sg[OFF]);
#else
(void) gtty(fd, &sg[OFF]);
#endif
sg[ON] = sg[OFF];
#ifdef SYSV
sg[ON].c_lflag &= ~(ICANON|ECHO);
sg[ON].c_cc[VMIN] = 1;
sg[ON].c_cc[VTIME] = 0;
#else
sg[ON].sg_flags &= ~(ECHO | CRMOD);
sg[ON].sg_flags |= CBREAK;
#endif
}
#ifdef SYSV
(void) ioctl(fd, TCSETAW, (char *) &sg[ON]);
#else
(void) stty(fd, &sg[ON]);
#endif
read(fd, &c, 1);
#ifdef SYSV
(void) ioctl(fd, TCSETAW, (char *) &sg[OFF]);
#else
(void) stty(fd, &sg[OFF]);
#endif
return (int) c;
}
#ifdef __i386__
#define MAXCMD 1024
int rename(char *s1, char *s2)
{
char tmp[MAXCMD];
(void) sprintf(tmp, "mv %s %s", s1, s2);
(void) system(tmp);
}
/*
strstr - public-domain implementation of standard C library function
last edit: 02-Sep-1990 D A Gwyn
This is an original implementation based on an idea by D M Sunday,
essentially the "quick search" algorithm described in CACM V33 N8.
Unlike Sunday's implementation, this one does not wander past the
ends of the strings (which can cause malfunctions under certain
circumstances), nor does it require the length of the searched
text to be determined in advance. There are numerous other subtle
improvements too. The code is intended to be fully portable, but in
environments that do not conform to the C standard, you should check
the sections below marked "configure as required". There are also
a few compilation options, as follows:
#define ROBUST to obtain sane behavior when invoked with a null
pointer argument, at a miniscule cost in speed
#define ZAP to use memset() to zero the shift[] array; this may
be faster in some implementations, but could fail on
unusual architectures
#define DEBUG to enable assertions (bug detection)
*/
#define ROBUST
#define ZAP
#ifdef __STDC__
#include <stddef.h> /* defines size_t and NULL */
#include <limits.h> /* defines UCHAR_MAX */
#ifdef ZAP
typedef void *pointer;
extern pointer memset( pointer, int, size_t );
#endif
#else /* normal UNIX-like C environment assumed; configure as required: */
typedef unsigned size_t; /* type of result of sizeof */
#ifndef NULL
#define NULL 0 /* null pointer constant */
#endif
#define UCHAR_MAX 255 /* largest value of unsigned char */
/* 255 @ 8 bits, 65535 @ 16 bits */
#ifdef ZAP
typedef char *pointer;
extern pointer memset();
#endif
#define const /* nothing */
#endif /* __STDC__ */
#ifndef DEBUG
#define NDEBUG
#endif
#include <assert.h>
typedef const unsigned char cuc; /* char variety used in algorithm */
#define EOS '\0' /* C string terminator */
char * /* returns -> leftmost occurrence,
or null pointer if not present */
strstr( s1, s2 )
const char *s1; /* -> string to be searched */
const char *s2; /* -> search-pattern string */
{
register cuc *t; /* -> text character being tested */
register cuc *p; /* -> pattern char being tested */
register cuc *tx; /* -> possible start of match */
register size_t m; /* length of pattern */
register cuc *top; /* -> high water mark in text */
#if UCHAR_MAX > 255 /* too large for auto allocation */
static /* not malloc()ed; that can fail! */
#endif /* else allocate shift[] on stack */
size_t shift[UCHAR_MAX + 1]; /* pattern shift table */
#ifdef ROBUST /* not required by C standard */
if ( s1 == NULL || s2 == NULL )
return NULL; /* certainly, no match is found! */
#endif
/* Precompute shift intervals based on the pattern;
the length of the pattern is determined as a side effect: */
#ifdef ZAP
(void)memset( (pointer)&shift[1], 0, UCHAR_MAX * sizeof(size_t) );
#else
{
register unsigned char c;
c = UCHAR_MAX;
do
shift[c] = 0;
while ( --c > 0 );
}
#endif /* ZAP */
/* Note: shift[0] is undefined at this point (fixed later). */
for ( m = 1, p = (cuc *)s2; *p != EOS; ++m, ++p )
shift[(cuc)*p] = m;
assert(s2[m - 1] == EOS);
{
register unsigned char c;
c = UCHAR_MAX;
do
shift[c] = m - shift[c];
while ( --c > 0 );
/* Note: shift[0] is still undefined at this point. */
}
shift[0] = --m; /* shift[EOS]; important details! */
assert(s2[m] == EOS);
/* Try to find the pattern in the text string: */
for ( top = tx = (cuc *)s1; ; tx += shift[*(top = t)] )
{
for ( t = tx, p = (cuc *)s2; ; ++t, ++p )
{
if ( *p == EOS ) /* entire pattern matched */
return (char *)tx;
if ( *p != *t )
break;
}
if ( t < top ) /* idea due to ado@elsie.nci.nih.gov */
t = top; /* already scanned this far for EOS */
do {
assert(m > 0);
assert(t - tx < m);
if ( *t == EOS )
return NULL; /* no match */
}
while ( ++t - tx != m ); /* < */
}
}
#endif
#endif /* __unix__ */