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split.c
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C/C++ Source or Header
|
1993-04-16
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9KB
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586 lines
#include <stdio.h>
#include <string.h>
#include "utils.h"
#ifdef TESTING
#define MAXF 3
int
main ()
{
int i, numfields;
char thisline[1000];
char **words;
printf ("For today, atmost %d fields/line. FS = | only.\n", MAXF);
words = (char **) malloc (MAXF * sizeof (char *));
do
{
printf ("\n\nEnter a line: ");
if (NULL == gets (thisline))
break;
else
{
numfields = split (thisline, words, MAXF, "|");
printf ("\n%d fields.\n", numfields);
for (i = 0; i < (numfields > MAXF ? MAXF : numfields); i++)
printf ("%s\n", words[i]);
}
}
while (1 == 1);
return 0;
}
#endif /* TESTING */
/*
* split - divide a string into fields, like awk split()
*/
int /* number of fields, including overflow */
split (string, fields, nfields, sep)
char *string;
char *fields[]; /* list is not NULL-terminated */
int nfields; /* number of entries available in fields[] */
char *sep; /* "" white, "c" single char, "ab" [ab]+ */
{
register char *p = string;
register char c; /* latest character */
register char sepc = sep[0];
register char sepc2;
register int fn;
register char **fp = fields;
register char *sepp;
register int trimtrail;
/* white space */
if (sepc == '\0')
{
while ((c = *p++) == ' ' || c == '\t')
continue;
p--;
trimtrail = 1;
sep = " \t"; /* note, code below knows this is 2 long */
sepc = ' ';
}
else
trimtrail = 0;
sepc2 = sep[1]; /* now we can safely pick this up */
/* catch empties */
if (*p == '\0')
return (0);
/* single separator */
if (sepc2 == '\0')
{
fn = nfields;
for (;;)
{
*fp++ = p;
fn--;
if (fn == 0)
break;
while ((c = *p++) != sepc)
if (c == '\0')
return (nfields - fn);
*(p - 1) = '\0';
}
/* we have overflowed the fields vector -- just count them */
fn = nfields;
for (;;)
{
while ((c = *p++) != sepc)
if (c == '\0')
return (fn);
fn++;
}
/* not reached */
}
/* two separators */
if (sep[2] == '\0')
{
fn = nfields;
for (;;)
{
*fp++ = p;
fn--;
while ((c = *p++) != sepc && c != sepc2)
if (c == '\0')
{
if (trimtrail && **(fp - 1) == '\0')
fn++;
return (nfields - fn);
}
if (fn == 0)
break;
*(p - 1) = '\0';
while ((c = *p++) == sepc || c == sepc2)
continue;
p--;
}
/* we have overflowed the fields vector -- just count them */
fn = nfields;
while (c != '\0')
{
while ((c = *p++) == sepc || c == sepc2)
continue;
p--;
fn++;
while ((c = *p++) != '\0' && c != sepc && c != sepc2)
continue;
}
/* might have to trim trailing white space */
if (trimtrail)
{
p--;
while ((c = *--p) == sepc || c == sepc2)
continue;
p++;
if (*p != '\0')
{
if (fn == nfields + 1)
*p = '\0';
fn--;
}
}
return (fn);
}
/* n separators */
fn = 0;
for (;;)
{
if (fn < nfields)
*fp++ = p;
fn++;
for (;;)
{
c = *p++;
if (c == '\0')
return (fn);
sepp = sep;
while ((sepc = *sepp++) != '\0' && sepc != c)
continue;
if (sepc != '\0') /* it was a separator */
break;
}
if (fn < nfields)
*(p - 1) = '\0';
for (;;)
{
c = *p++;
sepp = sep;
while ((sepc = *sepp++) != '\0' && sepc != c)
continue;
if (sepc == '\0') /* it wasn't a separator */
break;
}
p--;
}
/* not reached */
}
#ifdef TEST_SPLIT
/*
* test program
* pgm runs regression
* pgm sep splits stdin lines by sep
* pgm str sep splits str by sep
* pgm str sep n splits str by sep n times
*/
int
main (argc, argv)
int argc;
char *argv[];
{
char buf[512];
register int n;
# define MNF 10
char *fields[MNF];
if (argc > 4)
for (n = atoi (argv[3]); n > 0; n--)
{
(void) strcpy (buf, argv[1]);
}
else if (argc > 3)
for (n = atoi (argv[3]); n > 0; n--)
{
(void) strcpy (buf, argv[1]);
(void) split (buf, fields, MNF, argv[2]);
}
else if (argc > 2)
dosplit (argv[1], argv[2]);
else if (argc > 1)
while (fgets (buf, sizeof (buf), stdin) != NULL)
{
buf[strlen (buf) - 1] = '\0'; /* stomp newline */
dosplit (buf, argv[1]);
}
else
regress ();
exit (0);
}
dosplit (string, seps)
char *string;
char *seps;
{
# define NF 5
char *fields[NF];
register int nf;
nf = split (string, fields, NF, seps);
print (nf, fields);
}
print (nf, fields)
int nf;
char *fields[];
{
register int fn;
printf ("%d:\t", nf);
for (fn = 0; fn < nf; fn++)
printf ("\"%s\"%s", fields[fn], (fn + 1 < nf) ? ", " : "\n");
}
#define RNF 5 /* some table entries know this */
struct
{
char *str;
char *seps;
int nf;
char *fi[RNF];
}
tests[] =
{
"", " ", 0,
{
""
}
,
" ", " ", 2,
{
"", ""
}
,
"x", " ", 1,
{
"x"
}
,
"xy", " ", 1,
{
"xy"
}
,
"x y", " ", 2,
{
"x", "y"
}
,
"abc def g ", " ", 5,
{
"abc", "def", "", "g", ""
}
,
" a bcd", " ", 4,
{
"", "", "a", "bcd"
}
,
"a b c d e f", " ", 6,
{
"a", "b", "c", "d", "e f"
}
,
" a b c d ", " ", 6,
{
"", "a", "b", "c", "d "
}
,
"", " _", 0,
{
""
}
,
" ", " _", 2,
{
"", ""
}
,
"x", " _", 1,
{
"x"
}
,
"x y", " _", 2,
{
"x", "y"
}
,
"ab _ cd", " _", 2,
{
"ab", "cd"
}
,
" a_b c ", " _", 5,
{
"", "a", "b", "c", ""
}
,
"a b c_d e f", " _", 6,
{
"a", "b", "c", "d", "e f"
}
,
" a b c d ", " _", 6,
{
"", "a", "b", "c", "d "
}
,
"", " _~", 0,
{
""
}
,
" ", " _~", 2,
{
"", ""
}
,
"x", " _~", 1,
{
"x"
}
,
"x y", " _~", 2,
{
"x", "y"
}
,
"ab _~ cd", " _~", 2,
{
"ab", "cd"
}
,
" a_b c~", " _~", 5,
{
"", "a", "b", "c", ""
}
,
"a b_c d~e f", " _~", 6,
{
"a", "b", "c", "d", "e f"
}
,
"~a b c d ", " _~", 6,
{
"", "a", "b", "c", "d "
}
,
"", " _~-", 0,
{
""
}
,
" ", " _~-", 2,
{
"", ""
}
,
"x", " _~-", 1,
{
"x"
}
,
"x y", " _~-", 2,
{
"x", "y"
}
,
"ab _~- cd", " _~-", 2,
{
"ab", "cd"
}
,
" a_b c~", " _~-", 5,
{
"", "a", "b", "c", ""
}
,
"a b_c-d~e f", " _~-", 6,
{
"a", "b", "c", "d", "e f"
}
,
"~a-b c d ", " _~-", 6,
{
"", "a", "b", "c", "d "
}
,
"", " ", 0,
{
""
}
,
" ", " ", 2,
{
"", ""
}
,
"x", " ", 1,
{
"x"
}
,
"xy", " ", 1,
{
"xy"
}
,
"x y", " ", 2,
{
"x", "y"
}
,
"abc def g ", " ", 4,
{
"abc", "def", "g", ""
}
,
" a bcd", " ", 3,
{
"", "a", "bcd"
}
,
"a b c d e f", " ", 6,
{
"a", "b", "c", "d", "e f"
}
,
" a b c d ", " ", 6,
{
"", "a", "b", "c", "d "
}
,
"", "", 0,
{
""
}
,
" ", "", 0,
{
""
}
,
"x", "", 1,
{
"x"
}
,
"xy", "", 1,
{
"xy"
}
,
"x y", "", 2,
{
"x", "y"
}
,
"abc def g ", "", 3,
{
"abc", "def", "g"
}
,
"\t a bcd", "", 2,
{
"a", "bcd"
}
,
" a \tb\t c ", "", 3,
{
"a", "b", "c"
}
,
"a b\tc d e f", "", 6,
{
"a", "b", "c", "d", "e f"
}
,
" a b c d e f ", "", 6,
{
"a", "b", "c", "d", "e f "
}
,
NULL, NULL, 0,
{
NULL
}
,
};
regress ()
{
char buf[512];
register int n;
char *fields[RNF + 1];
register int nf;
register int i;
register int printit;
register char *f;
for (n =