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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	bin/expr/expr.c	Lines:	90	218	41.3 %
Date:	2017-11-13	Branches:	38	136	27.9 %


/*	$OpenBSD: expr.c,v 1.26 2016/10/19 18:20:25 schwarze Exp $	*/
/*	$NetBSD: expr.c,v 1.3.6.1 1996/06/04 20:41:47 cgd Exp $	*/

/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <ctype.h>
#include <unistd.h>
#include <regex.h>
#include <err.h>

struct val	*make_int(int64_t);
struct val	*make_str(char *);
void		 free_value(struct val *);
int		 is_integer(struct val *, int64_t *);
int		 to_integer(struct val *);
void		 to_string(struct val *);
int		 is_zero_or_null(struct val *);
void		 nexttoken(int);
__dead void	 error(void);
struct val	*eval6(void);
struct val	*eval5(void);
struct val	*eval4(void);
struct val	*eval3(void);
struct val	*eval2(void);
struct val	*eval1(void);
struct val	*eval0(void);

enum token {
	OR, AND, EQ, LT, GT, ADD, SUB, MUL, DIV, MOD, MATCH, RP, LP,
	NE, LE, GE, OPERAND, EOI
};

struct val {
	enum {
		integer,
		string
	} type;

	union {
		char	       *s;
		int64_t		i;
	} u;
};

enum token	token;
struct val     *tokval;
char	      **av;

struct val *
make_int(int64_t i)
{
	struct val     *vp;

	vp = malloc(sizeof(*vp));
	if (vp == NULL) {
		err(3, NULL);
	}
	vp->type = integer;
	vp->u.i = i;
	return vp;
}


struct val *
make_str(char *s)
{
	struct val     *vp;

	vp = malloc(sizeof(*vp));
	if (vp == NULL || ((vp->u.s = strdup(s)) == NULL)) {
		err(3, NULL);
	}
	vp->type = string;
	return vp;
}


void
free_value(struct val *vp)
{
	if (vp->type == string)
		free(vp->u.s);
	free(vp);
}


/* determine if vp is an integer; if so, return it's value in *r */
int
is_integer(struct val *vp, int64_t *r)
{
	char	       *s;
	int		neg;
	int64_t		i;

	if (vp->type == integer) {
		*r = vp->u.i;
		return 1;
	}

	/*
	 * POSIX.2 defines an "integer" as an optional unary minus
	 * followed by digits.
	 */
	s = vp->u.s;
	i = 0;

	neg = (*s == '-');
	if (neg)
		s++;

	while (*s) {
		if (!isdigit((unsigned char)*s))
			return 0;

		i *= 10;
		i += *s - '0';

		s++;
	}

	if (neg)
		i *= -1;

	*r = i;
	return 1;
}


/* coerce to vp to an integer */
int
to_integer(struct val *vp)
{
	int64_t		r;

	if (vp->type == integer)
		return 1;

	if (is_integer(vp, &r)) {
		free(vp->u.s);
		vp->u.i = r;
		vp->type = integer;
		return 1;
	}

	return 0;
}


/* coerce to vp to an string */
void
to_string(struct val *vp)
{
	char	       *tmp;

	if (vp->type == string)
		return;

	if (asprintf(&tmp, "%lld", vp->u.i) == -1)
		err(3, NULL);

	vp->type = string;
	vp->u.s = tmp;
}

int
is_zero_or_null(struct val *vp)
{
	if (vp->type == integer)
		return vp->u.i == 0;
	else
		return *vp->u.s == 0 || (to_integer(vp) && vp->u.i == 0);
}

void
nexttoken(int pat)
{
	char	       *p;

	if ((p = *av) == NULL) {
		token = EOI;
		return;
	}
	av++;


	if (pat == 0 && p[0] != '\0') {
		if (p[1] == '\0') {
			const char     *x = "|&=<>+-*/%:()";
			char	       *i;	/* index */

			if ((i = strchr(x, *p)) != NULL) {
				token = i - x;
				return;
			}
		} else if (p[1] == '=' && p[2] == '\0') {
			switch (*p) {
			case '<':
				token = LE;
				return;
			case '>':
				token = GE;
				return;
			case '!':
				token = NE;
				return;
			}
		}
	}
	tokval = make_str(p);
	token = OPERAND;
	return;
}

__dead void
error(void)
{
	errx(2, "syntax error");
}

struct val *
eval6(void)
{
	struct val     *v;

	if (token == OPERAND) {
		nexttoken(0);
		return tokval;
	} else if (token == RP) {
		nexttoken(0);
		v = eval0();
		if (token != LP)
			error();
		nexttoken(0);
		return v;
	} else
		error();
}

/* Parse and evaluate match (regex) expressions */
struct val *
eval5(void)
{
	regex_t		rp;
	regmatch_t	rm[2];
	char		errbuf[256];
	int		eval;
	struct val     *l, *r;
	struct val     *v;

	l = eval6();
	while (token == MATCH) {
		nexttoken(1);
		r = eval6();

		/* coerce to both arguments to strings */
		to_string(l);
		to_string(r);

		/* compile regular expression */
		if ((eval = regcomp(&rp, r->u.s, 0)) != 0) {
			regerror(eval, &rp, errbuf, sizeof(errbuf));
			errx(2, "%s", errbuf);
		}

		/* compare string against pattern --  remember that patterns
		   are anchored to the beginning of the line */
		if (regexec(&rp, l->u.s, 2, rm, 0) == 0 && rm[0].rm_so == 0) {
			if (rm[1].rm_so >= 0) {
				*(l->u.s + rm[1].rm_eo) = '\0';
				v = make_str(l->u.s + rm[1].rm_so);

			} else {
				v = make_int(rm[0].rm_eo - rm[0].rm_so);
			}
		} else {
			if (rp.re_nsub == 0) {
				v = make_int(0);
			} else {
				v = make_str("");
			}
		}

		/* free arguments and pattern buffer */
		free_value(l);
		free_value(r);
		regfree(&rp);

		l = v;
	}

	return l;
}

/* Parse and evaluate multiplication and division expressions */
struct val *
eval4(void)
{
	struct val     *l, *r;
	enum token	op;

	l = eval5();
	while ((op = token) == MUL || op == DIV || op == MOD) {
		nexttoken(0);
		r = eval5();

		if (!to_integer(l) || !to_integer(r)) {
			errx(2, "non-numeric argument");
		}

		if (op == MUL) {
			l->u.i *= r->u.i;
		} else {
			if (r->u.i == 0) {
				errx(2, "division by zero");
			}
			if (op == DIV) {
				if (l->u.i != INT64_MIN || r->u.i != -1)
					l->u.i /= r->u.i;
			} else {
				if (l->u.i != INT64_MIN || r->u.i != -1)
					l->u.i %= r->u.i;
				else
					l->u.i = 0;
			}
		}

		free_value(r);
	}

	return l;
}

/* Parse and evaluate addition and subtraction expressions */
struct val *
eval3(void)
{
	struct val     *l, *r;
	enum token	op;

	l = eval4();
	while ((op = token) == ADD || op == SUB) {
		nexttoken(0);
		r = eval4();

		if (!to_integer(l) || !to_integer(r)) {
			errx(2, "non-numeric argument");
		}

		if (op == ADD) {
			l->u.i += r->u.i;
		} else {
			l->u.i -= r->u.i;
		}

		free_value(r);
	}

	return l;
}

/* Parse and evaluate comparison expressions */
struct val *
eval2(void)
{
	struct val     *l, *r;
	enum token	op;
	int64_t		v = 0, li, ri;

	l = eval3();
	while ((op = token) == EQ || op == NE || op == LT || op == GT ||
	    op == LE || op == GE) {
		nexttoken(0);
		r = eval3();

		if (is_integer(l, &li) && is_integer(r, &ri)) {
			switch (op) {
			case GT:
				v = (li >  ri);
				break;
			case GE:
				v = (li >= ri);
				break;
			case LT:
				v = (li <  ri);
				break;
			case LE:
				v = (li <= ri);
				break;
			case EQ:
				v = (li == ri);
				break;
			case NE:
				v = (li != ri);
				break;
			default:
				break;
			}
		} else {
			to_string(l);
			to_string(r);

			switch (op) {
			case GT:
				v = (strcoll(l->u.s, r->u.s) > 0);
				break;
			case GE:
				v = (strcoll(l->u.s, r->u.s) >= 0);
				break;
			case LT:
				v = (strcoll(l->u.s, r->u.s) < 0);
				break;
			case LE:
				v = (strcoll(l->u.s, r->u.s) <= 0);
				break;
			case EQ:
				v = (strcoll(l->u.s, r->u.s) == 0);
				break;
			case NE:
				v = (strcoll(l->u.s, r->u.s) != 0);
				break;
			default:
				break;
			}
		}

		free_value(l);
		free_value(r);
		l = make_int(v);
	}

	return l;
}

/* Parse and evaluate & expressions */
struct val *
eval1(void)
{
	struct val     *l, *r;

	l = eval2();
	while (token == AND) {
		nexttoken(0);
		r = eval2();

		if (is_zero_or_null(l) || is_zero_or_null(r)) {
			free_value(l);
			free_value(r);
			l = make_int(0);
		} else {
			free_value(r);
		}
	}

	return l;
}

/* Parse and evaluate | expressions */
struct val *
eval0(void)
{
	struct val     *l, *r;

	l = eval1();
	while (token == OR) {
		nexttoken(0);
		r = eval1();

		if (is_zero_or_null(l)) {
			free_value(l);
			l = r;
		} else {
			free_value(r);
		}
	}

	return l;
}


int
main(int argc, char *argv[])
{
	struct val     *vp;

	if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
		err(2, "pledge");

	if (argc > 1 && !strcmp(argv[1], "--"))
		argv++;

	av = argv + 1;

	nexttoken(0);
	vp = eval0();

	if (token != EOI)
		error();

	if (vp->type == integer)
		printf("%lld\n", vp->u.i);
	else
		printf("%s\n", vp->u.s);

	return is_zero_or_null(vp);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: expr.c,v 1.26 2016/10/19 18:20:25 schwarze Exp $ */
2			/* $NetBSD: expr.c,v 1.3.6.1 1996/06/04 20:41:47 cgd Exp $ */
3
4			/*
5			* Written by J.T. Conklin <jtc@netbsd.org>.
6			* Public domain.
7			*/
8
9			#include <stdio.h>
10			#include <stdint.h>
11			#include <stdlib.h>
12			#include <string.h>
13			#include <limits.h>
14			#include <ctype.h>
15			#include <unistd.h>
16			#include <regex.h>
17			#include <err.h>
18
19			struct val *make_int(int64_t);
20			struct val make_str(char );
21			void free_value(struct val *);
22			int is_integer(struct val , int64_t );
23			int to_integer(struct val *);
24			void to_string(struct val *);
25			int is_zero_or_null(struct val *);
26			void nexttoken(int);
27			__dead void error(void);
28			struct val *eval6(void);
29			struct val *eval5(void);
30			struct val *eval4(void);
31			struct val *eval3(void);
32			struct val *eval2(void);
33			struct val *eval1(void);
34			struct val *eval0(void);
35
36			enum token {
37			OR, AND, EQ, LT, GT, ADD, SUB, MUL, DIV, MOD, MATCH, RP, LP,
38			NE, LE, GE, OPERAND, EOI
39			};
40
41			struct val {
42			enum {
43			integer,
44			string
45			} type;
46
47			union {
48			char *s;
49			int64_t i;
50			} u;
51			};
52
53			enum token token;
54			struct val *tokval;
55			char **av;
56
57			struct val *
58			make_int(int64_t i)
59			{
60			struct val *vp;
61
62			vp = malloc(sizeof(*vp));
63			if (vp == NULL) {
64			err(3, NULL);
65			}
66			vp->type = integer;
67			vp->u.i = i;
68			return vp;
69			}
70
71
72			struct val *
73			make_str(char *s)
74			{
75			struct val *vp;
76
77		1940	vp = malloc(sizeof(*vp));
78	✓✗✗✓	1940	if (vp == NULL \|\| ((vp->u.s = strdup(s)) == NULL)) {
79			err(3, NULL);
80			}
81		970	vp->type = string;
82		970	return vp;
83			}
84
85
86			void
87			free_value(struct val *vp)
88			{
89	✗✓	970	if (vp->type == string)
90			free(vp->u.s);
91		485	free(vp);
92		485	}
93
94
95			/* determine if vp is an integer; if so, return it's value in r /
96			int
97			is_integer(struct val vp, int64_t r)
98			{
99			char *s;
100			int neg;
101			int64_t i;
102
103	✗✓	1940	if (vp->type == integer) {
104			*r = vp->u.i;
105			return 1;
106			}
107
108			/*
109			* POSIX.2 defines an "integer" as an optional unary minus
110			* followed by digits.
111			*/
112		970	s = vp->u.s;
113			i = 0;
114
115		970	neg = (*s == '-');
116	✗✓	970	if (neg)
117			s++;
118
119	✓✓	4750	while (*s) {
120	✗✓	1405	if (!isdigit((unsigned char)*s))
121			return 0;
122
123		1405	i *= 10;
124		1405	i += *s - '0';
125
126		1405	s++;
127			}
128
129	✗✓	970	if (neg)
130			i *= -1;
131
132		970	*r = i;
133		970	return 1;
134		970	}
135
136
137			/* coerce to vp to an integer */
138			int
139			to_integer(struct val *vp)
140			{
141		1940	int64_t r;
142
143	✗✓	970	if (vp->type == integer)
144			return 1;
145
146	✓✗	970	if (is_integer(vp, &r)) {
147		970	free(vp->u.s);
148		970	vp->u.i = r;
149		970	vp->type = integer;
150		970	return 1;
151			}
152
153			return 0;
154		970	}
155
156
157			/* coerce to vp to an string */
158			void
159			to_string(struct val *vp)
160			{
161			char *tmp;
162
163			if (vp->type == string)
164			return;
165
166			if (asprintf(&tmp, "%lld", vp->u.i) == -1)
167			err(3, NULL);
168
169			vp->type = string;
170			vp->u.s = tmp;
171			}
172
173			int
174			is_zero_or_null(struct val *vp)
175			{
176	✓✗	970	if (vp->type == integer)
177		485	return vp->u.i == 0;
178			else
179			return *vp->u.s == 0 \|\| (to_integer(vp) && vp->u.i == 0);
180		485	}
181
182			void
183			nexttoken(int pat)
184			{
185			char *p;
186
187	✓✓	3880	if ((p = *av) == NULL) {
188		485	token = EOI;
189		485	return;
190			}
191		1455	av++;
192
193
194	✓✗✓✗	2910	if (pat == 0 && p[0] != '\0') {
195	✓✓	1455	if (p[1] == '\0') {
196			const char x = "\|&=<>+-/%:()";
197			char i; / index */
198
199	✓✓	1020	if ((i = strchr(x, *p)) != NULL) {
200		485	token = i - x;
201		485	return;
202			}
203	✓✓✗✓ ✗✗	970	} else if (p[1] == '=' && p[2] == '\0') {
204			switch (*p) {
205			case '<':
206			token = LE;
207			return;
208			case '>':
209			token = GE;
210			return;
211			case '!':
212			token = NE;
213			return;
214			}
215			}
216			}
217		970	tokval = make_str(p);
218		970	token = OPERAND;
219		970	return;
220		1940	}
221
222			__dead void
223			error(void)
224			{
225			errx(2, "syntax error");
226			}
227
228			struct val *
229			eval6(void)
230			{
231			struct val *v;
232
233	✓✗	1940	if (token == OPERAND) {
234		970	nexttoken(0);
235		970	return tokval;
236			} else if (token == RP) {
237			nexttoken(0);
238			v = eval0();
239			if (token != LP)
240			error();
241			nexttoken(0);
242			return v;
243			} else
244			error();
245		970	}
246
247			/* Parse and evaluate match (regex) expressions */
248			struct val *
249			eval5(void)
250			{
251		1940	regex_t rp;
252		970	regmatch_t rm[2];
253		970	char errbuf[256];
254			int eval;
255			struct val l, r;
256			struct val *v;
257
258		970	l = eval6();
259	✗✓	1940	while (token == MATCH) {
260			nexttoken(1);
261			r = eval6();
262
263			/* coerce to both arguments to strings */
264			to_string(l);
265			to_string(r);
266
267			/* compile regular expression */
268			if ((eval = regcomp(&rp, r->u.s, 0)) != 0) {
269			regerror(eval, &rp, errbuf, sizeof(errbuf));
270			errx(2, "%s", errbuf);
271			}
272
273			/* compare string against pattern -- remember that patterns
274			are anchored to the beginning of the line */
275			if (regexec(&rp, l->u.s, 2, rm, 0) == 0 && rm[0].rm_so == 0) {
276			if (rm[1].rm_so >= 0) {
277			*(l->u.s + rm[1].rm_eo) = '\0';
278			v = make_str(l->u.s + rm[1].rm_so);
279
280			} else {
281			v = make_int(rm[0].rm_eo - rm[0].rm_so);
282			}
283			} else {
284			if (rp.re_nsub == 0) {
285			v = make_int(0);
286			} else {
287			v = make_str("");
288			}
289			}
290
291			/* free arguments and pattern buffer */
292			free_value(l);
293			free_value(r);
294			regfree(&rp);
295
296			l = v;
297			}
298
299		970	return l;
300		970	}
301
302			/* Parse and evaluate multiplication and division expressions */
303			struct val *
304			eval4(void)
305			{
306			struct val l, r;
307			enum token op;
308
309		1940	l = eval5();
310	✗✓	1940	while ((op = token) == MUL \|\| op == DIV \|\| op == MOD) {
311			nexttoken(0);
312			r = eval5();
313
314			if (!to_integer(l) \|\| !to_integer(r)) {
315			errx(2, "non-numeric argument");
316			}
317
318			if (op == MUL) {
319			l->u.i *= r->u.i;
320			} else {
321			if (r->u.i == 0) {
322			errx(2, "division by zero");
323			}
324			if (op == DIV) {
325			if (l->u.i != INT64_MIN \|\| r->u.i != -1)
326			l->u.i /= r->u.i;
327			} else {
328			if (l->u.i != INT64_MIN \|\| r->u.i != -1)
329			l->u.i %= r->u.i;
330			else
331			l->u.i = 0;
332			}
333			}
334
335			free_value(r);
336			}
337
338		970	return l;
339			}
340
341			/* Parse and evaluate addition and subtraction expressions */
342			struct val *
343			eval3(void)
344			{
345			struct val l, r;
346			enum token op;
347
348		970	l = eval4();
349	✓✓	1940	while ((op = token) == ADD \|\| op == SUB) {
350		485	nexttoken(0);
351		485	r = eval4();
352
353	✓✗✗✓	970	if (!to_integer(l) \|\| !to_integer(r)) {
354			errx(2, "non-numeric argument");
355			}
356
357		485	if (op == ADD) {
358		485	l->u.i += r->u.i;
359			} else {
360		485	l->u.i -= r->u.i;
361			}
362
363		485	free_value(r);
364			}
365
366		485	return l;
367			}
368
369			/* Parse and evaluate comparison expressions */
370			struct val *
371			eval2(void)
372			{
373			struct val l, r;
374			enum token op;
375		970	int64_t v = 0, li, ri;
376
377		485	l = eval3();
378	✗✓	1940	while ((op = token) == EQ \|\| op == NE \|\| op == LT \|\| op == GT \|\|
379		970	op == LE \|\| op == GE) {
380			nexttoken(0);
381			r = eval3();
382
383			if (is_integer(l, &li) && is_integer(r, &ri)) {
384			switch (op) {
385			case GT:
386			v = (li > ri);
387			break;
388			case GE:
389			v = (li >= ri);
390			break;
391			case LT:
392			v = (li < ri);
393			break;
394			case LE:
395			v = (li <= ri);
396			break;
397			case EQ:
398			v = (li == ri);
399			break;
400			case NE:
401			v = (li != ri);
402			break;
403			default:
404			break;
405			}
406			} else {
407			to_string(l);
408			to_string(r);
409
410			switch (op) {
411			case GT:
412			v = (strcoll(l->u.s, r->u.s) > 0);
413			break;
414			case GE:
415			v = (strcoll(l->u.s, r->u.s) >= 0);
416			break;
417			case LT:
418			v = (strcoll(l->u.s, r->u.s) < 0);
419			break;
420			case LE:
421			v = (strcoll(l->u.s, r->u.s) <= 0);
422			break;
423			case EQ:
424			v = (strcoll(l->u.s, r->u.s) == 0);
425			break;
426			case NE:
427			v = (strcoll(l->u.s, r->u.s) != 0);
428			break;
429			default:
430			break;
431			}
432			}
433
434			free_value(l);
435			free_value(r);
436			l = make_int(v);
437			}
438
439		485	return l;
440		485	}
441
442			/* Parse and evaluate & expressions */
443			struct val *
444			eval1(void)
445			{
446			struct val l, r;
447
448		970	l = eval2();
449	✗✓	970	while (token == AND) {
450			nexttoken(0);
451			r = eval2();
452
453			if (is_zero_or_null(l) \|\| is_zero_or_null(r)) {
454			free_value(l);
455			free_value(r);
456			l = make_int(0);
457			} else {
458			free_value(r);
459			}
460			}
461
462		485	return l;
463			}
464
465			/* Parse and evaluate \| expressions */
466			struct val *
467			eval0(void)
468			{
469			struct val l, r;
470
471		970	l = eval1();
472	✗✓	970	while (token == OR) {
473			nexttoken(0);
474			r = eval1();
475
476			if (is_zero_or_null(l)) {
477			free_value(l);
478			l = r;
479			} else {
480			free_value(r);
481			}
482			}
483
484		485	return l;
485			}
486
487
488			int
489			main(int argc, char *argv[])
490			{
491			struct val *vp;
492
493	✗✓	970	if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
494			err(2, "pledge");
495
496	✓✗✗✓	970	if (argc > 1 && !strcmp(argv[1], "--"))
497			argv++;
498
499		485	av = argv + 1;
500
501		485	nexttoken(0);
502		485	vp = eval0();
503
504	✗✓	485	if (token != EOI)
505			error();
506
507	✓✗	485	if (vp->type == integer)
508		485	printf("%lld\n", vp->u.i);
509			else
510			printf("%s\n", vp->u.s);
511
512		485	return is_zero_or_null(vp);
513			}