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4973 right-hear 1
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
2
#include 
3
#include 
4
 
5
/*
6
 - split - divide a string into fields, like awk split()
7
 = int split(char *string, char *fields[], int nfields, char *sep);
8
 */
9
int				/* number of fields, including overflow */
10
split(string, fields, nfields, sep)
11
char *string;
12
char *fields[];			/* list is not NULL-terminated */
13
int nfields;			/* number of entries available in fields[] */
14
char *sep;			/* "" white, "c" single char, "ab" [ab]+ */
15
{
16
	register char *p = string;
17
	register char c;			/* latest character */
18
	register char sepc = sep[0];
19
	register char sepc2;
20
	register int fn;
21
	register char **fp = fields;
22
	register char *sepp;
23
	register int trimtrail;
24
 
25
	/* white space */
26
	if (sepc == '\0') {
27
		while ((c = *p++) == ' ' || c == '\t')
28
			continue;
29
		p--;
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		trimtrail = 1;
31
		sep = " \t";	/* note, code below knows this is 2 long */
32
		sepc = ' ';
33
	} else
34
		trimtrail = 0;
35
	sepc2 = sep[1];		/* now we can safely pick this up */
36
 
37
	/* catch empties */
38
	if (*p == '\0')
39
		return(0);
40
 
41
	/* single separator */
42
	if (sepc2 == '\0') {
43
		fn = nfields;
44
		for (;;) {
45
			*fp++ = p;
46
			fn--;
47
			if (fn == 0)
48
				break;
49
			while ((c = *p++) != sepc)
50
				if (c == '\0')
51
					return(nfields - fn);
52
			*(p-1) = '\0';
53
		}
54
		/* we have overflowed the fields vector -- just count them */
55
		fn = nfields;
56
		for (;;) {
57
			while ((c = *p++) != sepc)
58
				if (c == '\0')
59
					return(fn);
60
			fn++;
61
		}
62
		/* not reached */
63
	}
64
 
65
	/* two separators */
66
	if (sep[2] == '\0') {
67
		fn = nfields;
68
		for (;;) {
69
			*fp++ = p;
70
			fn--;
71
			while ((c = *p++) != sepc && c != sepc2)
72
				if (c == '\0') {
73
					if (trimtrail && **(fp-1) == '\0')
74
						fn++;
75
					return(nfields - fn);
76
				}
77
			if (fn == 0)
78
				break;
79
			*(p-1) = '\0';
80
			while ((c = *p++) == sepc || c == sepc2)
81
				continue;
82
			p--;
83
		}
84
		/* we have overflowed the fields vector -- just count them */
85
		fn = nfields;
86
		while (c != '\0') {
87
			while ((c = *p++) == sepc || c == sepc2)
88
				continue;
89
			p--;
90
			fn++;
91
			while ((c = *p++) != '\0' && c != sepc && c != sepc2)
92
				continue;
93
		}
94
		/* might have to trim trailing white space */
95
		if (trimtrail) {
96
			p--;
97
			while ((c = *--p) == sepc || c == sepc2)
98
				continue;
99
			p++;
100
			if (*p != '\0') {
101
				if (fn == nfields+1)
102
					*p = '\0';
103
				fn--;
104
			}
105
		}
106
		return(fn);
107
	}
108
 
109
	/* n separators */
110
	fn = 0;
111
	for (;;) {
112
		if (fn < nfields)
113
			*fp++ = p;
114
		fn++;
115
		for (;;) {
116
			c = *p++;
117
			if (c == '\0')
118
				return(fn);
119
			sepp = sep;
120
			while ((sepc = *sepp++) != '\0' && sepc != c)
121
				continue;
122
			if (sepc != '\0')	/* it was a separator */
123
				break;
124
		}
125
		if (fn < nfields)
126
			*(p-1) = '\0';
127
		for (;;) {
128
			c = *p++;
129
			sepp = sep;
130
			while ((sepc = *sepp++) != '\0' && sepc != c)
131
				continue;
132
			if (sepc == '\0')	/* it wasn't a separator */
133
				break;
134
		}
135
		p--;
136
	}
137
 
138
	/* not reached */
139
}
140
 
141
#ifdef TEST_SPLIT
142
 
143
 
144
/*
145
 * test program
146
 * pgm		runs regression
147
 * pgm sep	splits stdin lines by sep
148
 * pgm str sep	splits str by sep
149
 * pgm str sep n	splits str by sep n times
150
 */
151
int
152
main(argc, argv)
153
int argc;
154
char *argv[];
155
{
156
	char buf[512];
157
	register int n;
158
#	define	MNF	10
159
	char *fields[MNF];
160
 
161
	if (argc > 4)
162
		for (n = atoi(argv[3]); n > 0; n--) {
163
			(void) strcpy(buf, argv[1]);
164
		}
165
	else if (argc > 3)
166
		for (n = atoi(argv[3]); n > 0; n--) {
167
			(void) strcpy(buf, argv[1]);
168
			(void) split(buf, fields, MNF, argv[2]);
169
		}
170
	else if (argc > 2)
171
		dosplit(argv[1], argv[2]);
172
	else if (argc > 1)
173
		while (fgets(buf, sizeof(buf), stdin) != NULL) {
174
			buf[strlen(buf)-1] = '\0';	/* stomp newline */
175
			dosplit(buf, argv[1]);
176
		}
177
	else
178
		regress();
179
 
180
	exit(0);
181
}
182
 
183
dosplit(string, seps)
184
char *string;
185
char *seps;
186
{
187
#	define	NF	5
188
	char *fields[NF];
189
	register int nf;
190
 
191
	nf = split(string, fields, NF, seps);
192
	print(nf, NF, fields);
193
}
194
 
195
print(nf, nfp, fields)
196
int nf;
197
int nfp;
198
char *fields[];
199
{
200
	register int fn;
201
	register int bound;
202
 
203
	bound = (nf > nfp) ? nfp : nf;
204
	printf("%d:\t", nf);
205
	for (fn = 0; fn < bound; fn++)
206
		printf("\"%s\"%s", fields[fn], (fn+1 < nf) ? ", " : "\n");
207
}
208
 
209
#define	RNF	5		/* some table entries know this */
210
struct {
211
	char *str;
212
	char *seps;
213
	int nf;
214
	char *fi[RNF];
215
} tests[] = {
216
	"",		" ",	0,	{ "" },
217
	" ",		" ",	2,	{ "", "" },
218
	"x",		" ",	1,	{ "x" },
219
	"xy",		" ",	1,	{ "xy" },
220
	"x y",		" ",	2,	{ "x", "y" },
221
	"abc def  g ",	" ",	5,	{ "abc", "def", "", "g", "" },
222
	"  a bcd",	" ",	4,	{ "", "", "a", "bcd" },
223
	"a b c d e f",	" ",	6,	{ "a", "b", "c", "d", "e f" },
224
	" a b c d ",	" ",	6,	{ "", "a", "b", "c", "d " },
225
 
226
	"",		" _",	0,	{ "" },
227
	" ",		" _",	2,	{ "", "" },
228
	"x",		" _",	1,	{ "x" },
229
	"x y",		" _",	2,	{ "x", "y" },
230
	"ab _ cd",	" _",	2,	{ "ab", "cd" },
231
	" a_b  c ",	" _",	5,	{ "", "a", "b", "c", "" },
232
	"a b c_d e f",	" _",	6,	{ "a", "b", "c", "d", "e f" },
233
	" a b c d ",	" _",	6,	{ "", "a", "b", "c", "d " },
234
 
235
	"",		" _~",	0,	{ "" },
236
	" ",		" _~",	2,	{ "", "" },
237
	"x",		" _~",	1,	{ "x" },
238
	"x y",		" _~",	2,	{ "x", "y" },
239
	"ab _~ cd",	" _~",	2,	{ "ab", "cd" },
240
	" a_b  c~",	" _~",	5,	{ "", "a", "b", "c", "" },
241
	"a b_c d~e f",	" _~",	6,	{ "a", "b", "c", "d", "e f" },
242
	"~a b c d ",	" _~",	6,	{ "", "a", "b", "c", "d " },
243
 
244
	"",		" _~-",	0,	{ "" },
245
	" ",		" _~-",	2,	{ "", "" },
246
	"x",		" _~-",	1,	{ "x" },
247
	"x y",		" _~-",	2,	{ "x", "y" },
248
	"ab _~- cd",	" _~-",	2,	{ "ab", "cd" },
249
	" a_b  c~",	" _~-",	5,	{ "", "a", "b", "c", "" },
250
	"a b_c-d~e f",	" _~-",	6,	{ "a", "b", "c", "d", "e f" },
251
	"~a-b c d ",	" _~-",	6,	{ "", "a", "b", "c", "d " },
252
 
253
	"",		"  ",	0,	{ "" },
254
	" ",		"  ",	2,	{ "", "" },
255
	"x",		"  ",	1,	{ "x" },
256
	"xy",		"  ",	1,	{ "xy" },
257
	"x y",		"  ",	2,	{ "x", "y" },
258
	"abc def  g ",	"  ",	4,	{ "abc", "def", "g", "" },
259
	"  a bcd",	"  ",	3,	{ "", "a", "bcd" },
260
	"a b c d e f",	"  ",	6,	{ "a", "b", "c", "d", "e f" },
261
	" a b c d ",	"  ",	6,	{ "", "a", "b", "c", "d " },
262
 
263
	"",		"",	0,	{ "" },
264
	" ",		"",	0,	{ "" },
265
	"x",		"",	1,	{ "x" },
266
	"xy",		"",	1,	{ "xy" },
267
	"x y",		"",	2,	{ "x", "y" },
268
	"abc def  g ",	"",	3,	{ "abc", "def", "g" },
269
	"\t a bcd",	"",	2,	{ "a", "bcd" },
270
	"  a \tb\t c ",	"",	3,	{ "a", "b", "c" },
271
	"a b c d e ",	"",	5,	{ "a", "b", "c", "d", "e" },
272
	"a b\tc d e f",	"",	6,	{ "a", "b", "c", "d", "e f" },
273
	" a b c d e f ",	"",	6,	{ "a", "b", "c", "d", "e f " },
274
 
275
	NULL,		NULL,	0,	{ NULL },
276
};
277
 
278
regress()
279
{
280
	char buf[512];
281
	register int n;
282
	char *fields[RNF+1];
283
	register int nf;
284
	register int i;
285
	register int printit;
286
	register char *f;
287
 
288
	for (n = 0; tests[n].str != NULL; n++) {
289
		(void) strcpy(buf, tests[n].str);
290
		fields[RNF] = NULL;
291
		nf = split(buf, fields, RNF, tests[n].seps);
292
		printit = 0;
293
		if (nf != tests[n].nf) {
294
			printf("split `%s' by `%s' gave %d fields, not %d\n",
295
				tests[n].str, tests[n].seps, nf, tests[n].nf);
296
			printit = 1;
297
		} else if (fields[RNF] != NULL) {
298
			printf("split() went beyond array end\n");
299
			printit = 1;
300
		} else {
301
			for (i = 0; i < nf && i < RNF; i++) {
302
				f = fields[i];
303
				if (f == NULL)
304
					f = "(NULL)";
305
				if (strcmp(f, tests[n].fi[i]) != 0) {
306
					printf("split `%s' by `%s', field %d is `%s', not `%s'\n",
307
						tests[n].str, tests[n].seps,
308
						i, fields[i], tests[n].fi[i]);
309
					printit = 1;
310
				}
311
			}
312
		}
313
		if (printit)
314
			print(nf, RNF, fields);
315
	}
316
}
317
#endif