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