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- #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 = 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, fields);
- }
- }
-
- #endif
-