317 lines
6.9 KiB
C
317 lines
6.9 KiB
C
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
/*
|
|
- split - divide a string into fields, like awk split()
|
|
= int split(char *string, char *fields[], int nfields, char *sep);
|
|
*/
|
|
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, NF, fields);
|
|
}
|
|
|
|
print(nf, nfp, fields)
|
|
int nf;
|
|
int nfp;
|
|
char *fields[];
|
|
{
|
|
register int fn;
|
|
register int bound;
|
|
|
|
bound = (nf > nfp) ? nfp : nf;
|
|
printf("%d:\t", nf);
|
|
for (fn = 0; fn < bound; 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 c d e ", "", 5, { "a", "b", "c", "d", "e" },
|
|
"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 = 0; tests[n].str != NULL; n++) {
|
|
(void) strcpy(buf, tests[n].str);
|
|
fields[RNF] = NULL;
|
|
nf = split(buf, fields, RNF, tests[n].seps);
|
|
printit = 0;
|
|
if (nf != tests[n].nf) {
|
|
printf("split `%s' by `%s' gave %d fields, not %d\n",
|
|
tests[n].str, tests[n].seps, nf, tests[n].nf);
|
|
printit = 1;
|
|
} else if (fields[RNF] != NULL) {
|
|
printf("split() went beyond array end\n");
|
|
printit = 1;
|
|
} else {
|
|
for (i = 0; i < nf && i < RNF; i++) {
|
|
f = fields[i];
|
|
if (f == NULL)
|
|
f = "(NULL)";
|
|
if (strcmp(f, tests[n].fi[i]) != 0) {
|
|
printf("split `%s' by `%s', field %d is `%s', not `%s'\n",
|
|
tests[n].str, tests[n].seps,
|
|
i, fields[i], tests[n].fi[i]);
|
|
printit = 1;
|
|
}
|
|
}
|
|
}
|
|
if (printit)
|
|
print(nf, RNF, fields);
|
|
}
|
|
}
|
|
#endif
|