ref: a7a315bff61bff58a9c918294f53c1e87d7ae7bb
dir: /sys/src/ape/lib/v/getfields.c/
#define _RESEARCH_SOURCE
#include <libv.h>
#include <string.h>
static char is_sep[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
static char is_field[256] = {
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
};
static char last_sep[256];
char *
setfields(char *arg)
{
register unsigned char *s;
register i;
for(i = 1, s = (unsigned char *)last_sep; i < 256; i++)
if(is_sep[i])
*s++ = i;
*s = 0;
memset(is_sep, 0, sizeof is_sep);
memset(is_field, 1, sizeof is_field);
for(s = (unsigned char *)arg; *s;){
is_sep[*s] = 1;
is_field[*s++] = 0;
}
is_field[0] = 0;
return(last_sep);
}
int
getfields(char *ss, char **sp, int nptrs)
{
register unsigned char *s = (unsigned char *)ss;
register unsigned char **p = (unsigned char **)sp;
register unsigned c;
for(;;){
if(--nptrs < 0) break;
*p++ = s;
while(is_field[c = *s++])
;
if(c == 0) break;
s[-1] = 0;
}
if(nptrs > 0)
*p = 0;
else if(--s >= (unsigned char *)ss)
*s = c;
return(p - (unsigned char **)sp);
}
int
getmfields(char *ss, char **sp, int nptrs)
{
register unsigned char *s = (unsigned char *)ss;
register unsigned char **p = (unsigned char **)sp;
register unsigned c;
if(nptrs <= 0)
return(0);
goto flushdelim;
for(;;){
*p++ = s;
if(--nptrs == 0) break;
while(is_field[c = *s++])
;
/*
* s is now pointing 1 past the delimiter of the last field
* c is the delimiter
*/
if(c == 0) break;
s[-1] = 0;
flushdelim:
while(is_sep[c = *s++])
;
/*
* s is now pointing 1 past the beginning of the next field
* c is the first letter of the field
*/
if(c == 0) break;
s--;
/*
* s is now pointing to the beginning of the next field
* c is the first letter of the field
*/
}
if(nptrs > 0)
*p = 0;
return(p - (unsigned char **)sp);
}
#ifdef MAIN
#include <fio.h>
main()
{
char *fields[256];
char *s;
int n, i;
char buf[1024];
print("go:\n");
while(s = Frdline(0)){
strcpy(buf, s);
Fprint(1, "getf:");
n = getfields(s, fields, 4);
for(i = 0; i < n; i++)
Fprint(1, " >%s<", fields[i]);
Fputc(1, '\n');
Fprint(1, "getmf:");
n = getmfields(buf, fields, 4);
for(i = 0; i < n; i++)
Fprint(1, " >%s<", fields[i]);
Fputc(1, '\n');
Fflush(1);
}
exit(0);
}
#endif