Category : UNIX Files
Archive   : REGEX.ZIP
Filename : GREP.C

 
Output of file : GREP.C contained in archive : REGEX.ZIP

#ifdef vms
#include stdio
#else
#include
#endif

/*
* Rudimentary grep to test regex routines.
*
* DEBUG is only applicable
* to oZ version of regex. Make sure to
* compile regex.c with -DDEBUG as well.
*
*/
extern char *re_comp();
extern re_exec();

main(argc,argv)
char *argv[];
{
char str[512];
FILE *f;
register int n;
register char *p;

if (argc < 2)
error("usage: grep pat [file]");

if ((p = re_comp(argv[1])) != 0) {
printf("\t%s: %s\n", p, argv[1]);
exit(1);
}
#ifdef DEBUG
symbolic(argv[1]);
#endif
if (p = argv[2]) {
if ((f = fopen(p, "r")) == NULL) {
printf("cannot open %s\n", argv[2]);
exit(1);
}
while ((n = load(str, f)) != EOF)
if (re_exec(str))
printf("%s\n",str);

}
exit(0);
}
load (s, f)
char *s;
FILE *f;
{
register int c;
static int lineno = 0;

while ((c = getc(f)) != '\n' && c != EOF)
*s++ = c;
if (c == EOF)
return (EOF);
*s = (char) 0;
return (++lineno);
}

error(s) char *s ;
{
fprintf(stderr,"%s\n",s);
exit(1);
}