[unix-history] / usr.bin / printf / printf.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)printf.c	5.9 (Berkeley) 6/1/90";
#endif /* not lint */

#include <sys/types.h>
#include <stdio.h>

#define PF(f, func) { \
	if (fieldwidth) \
		if (precision) \
			(void)printf(f, fieldwidth, precision, func); \
		else \
			(void)printf(f, fieldwidth, func); \
	else if (precision) \
		(void)printf(f, precision, func); \
	else \
		(void)printf(f, func); \
}

char **gargv;

main(argc, argv)
	int argc;
	char **argv;
{
	static char *skip1, *skip2;
	register char *format, *fmt, *start;
	register int end, fieldwidth, precision;
	char convch, nextch, *getstr(), *index(), *mklong();
	double getdouble();
	long getlong();

	if (argc < 2) {
		fprintf(stderr, "usage: printf format [arg ...]\n");
		exit(1);
	}

	/*
	 * Basic algorithm is to scan the format string for conversion
	 * specifications -- once one is found, find out if the field
	 * width or precision is a '*'; if it is, gather up value.  Note,
	 * format strings are reused as necessary to use up the provided
	 * arguments, arguments of zero/null string are provided to use
	 * up the format string.
	 */
	skip1 = "#-+ 0";
	skip2 = "*0123456789";

	escape(fmt = format = *++argv);		/* backslash interpretation */
	gargv = ++argv;
	for (;;) {
		end = 0;
		/* find next format specification */
next:		for (start = fmt;; ++fmt) {
			if (!*fmt) {
				/* avoid infinite loop */
				if (end == 1) {
					fprintf(stderr,
					    "printf: missing format character.\n");
					exit(1);
				}
				end = 1;
				if (fmt > start)
					(void)printf("%s", start);
				if (!*gargv)
					exit(0);
				fmt = format;
				goto next;
			}
			/* %% prints a % */
			if (*fmt == '%') {
				if (*++fmt != '%')
					break;
				*fmt++ = '\0';
				(void)printf("%s", start);
				goto next;
			}
		}

		/* skip to field width */
		for (; index(skip1, *fmt); ++fmt);
		fieldwidth = *fmt == '*' ? getint() : 0;

		/* skip to possible '.', get following precision */
		for (; index(skip2, *fmt); ++fmt);
		if (*fmt == '.')
			++fmt;
		precision = *fmt == '*' ? getint() : 0;

		/* skip to conversion char */
		for (; index(skip2, *fmt); ++fmt);
		if (!*fmt) {
			fprintf(stderr, "printf: missing format character.\n");
			exit(1);
		}

		convch = *fmt;
		nextch = *++fmt;
		*fmt = '\0';
		switch(convch) {
		case 'c': {
			char p = getchr();
			PF(start, p);
			break;
		}
		case 's': {
			char *p = getstr();
			PF(start, p);
			break;
		}
		case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
			char *f = mklong(start, convch);
			long p = getlong();
			PF(f, p);
			break;
		}
		case 'e': case 'E': case 'f': case 'g': case 'G': {
			double p = getdouble();
			PF(start, p);
			break;
		}
		default:
			fprintf(stderr, "printf: illegal format character.\n");
			exit(1);
		}
		*fmt = nextch;
	}
	/* NOTREACHED */
}

char *
mklong(str, ch)
	char *str, ch;
{
	int len;
	char *copy, *malloc();

	len = strlen(str) + 2;
	if (!(copy = malloc((u_int)len))) {	/* never freed; XXX */
		fprintf(stderr, "printf: out of memory.\n");
		exit(1);
	}
	bcopy(str, copy, len - 3);
	copy[len - 3] = 'l';
	copy[len - 2] = ch;
	copy[len - 1] = '\0';
	return(copy);
}

escape(fmt)
	register char *fmt;
{
	register char *store;
	register int value, c;

	for (store = fmt; c = *fmt; ++fmt, ++store) {
		if (c != '\\') {
			*store = c;
			continue;
		}
		switch (*++fmt) {
		case '\0':		/* EOS, user error */
			*store = '\\';
			*++store = '\0';
			return;
		case '\\':		/* backslash */
		case '\'':		/* single quote */
			*store = *fmt;
			break;
		case 'a':		/* bell/alert */
			*store = '\7';
			break;
		case 'b':		/* backspace */
			*store = '\b';
			break;
		case 'f':		/* form-feed */
			*store = '\f';
			break;
		case 'n':		/* newline */
			*store = '\n';
			break;
		case 'r':		/* carriage-return */
			*store = '\r';
			break;
		case 't':		/* horizontal tab */
			*store = '\t';
			break;
		case 'v':		/* vertical tab */
			*store = '\13';
			break;
					/* octal constant */
		case '0': case '1': case '2': case '3':
		case '4': case '5': case '6': case '7':
			for (c = 3, value = 0;
			    c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) {
				value <<= 3;
				value += *fmt - '0';
			}
			--fmt;
			*store = value;
			break;
		default:
			*store = *fmt;
			break;
		}
	}
	*store = '\0';
}

getchr()
{
	if (!*gargv)
		return((int)'\0');
	return((int)**gargv++);
}

char *
getstr()
{
	if (!*gargv)
		return("");
	return(*gargv++);
}

static char *number = "+-.0123456789";
getint()
{
	if (!*gargv)
		return(0);
	if (index(number, **gargv))
		return(atoi(*gargv++));
	return(asciicode());
}

long
getlong()
{
	long atol();

	if (!*gargv)
		return((long)0);
	if (index(number, **gargv))
		return(strtol(*gargv++, (char **)NULL, 0));
	return((long)asciicode());
}

double
getdouble()
{
	double atof();

	if (!*gargv)
		return((double)0);
	if (index(number, **gargv))
		return(atof(*gargv++));
	return((double)asciicode());
}

asciicode()
{
	register char ch;

	ch = **gargv;
	if (ch == '\'' || ch == '"')
		ch = (*gargv)[1];
	++gargv;
	return(ch);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	char copyright[] =
	36	"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
	37	All rights reserved.\n";
	38	#endif /* not lint */
	39
	40	#ifndef lint
	41	static char sccsid[] = "@(#)printf.c 5.9 (Berkeley) 6/1/90";
	42	#endif /* not lint */
	43
	44	#include <sys/types.h>
	45	#include <stdio.h>
	46
	47	#define PF(f, func) { \
	48	if (fieldwidth) \
	49	if (precision) \
	50	(void)printf(f, fieldwidth, precision, func); \
	51	else \
	52	(void)printf(f, fieldwidth, func); \
	53	else if (precision) \
	54	(void)printf(f, precision, func); \
	55	else \
	56	(void)printf(f, func); \
	57	}
	58
	59	char **gargv;
	60
	61	main(argc, argv)
	62	int argc;
	63	char **argv;
	64	{
65	static char skip1, skip2;
66	register char format, fmt, *start;
67	register int end, fieldwidth, precision;
68	char convch, nextch, getstr(), index(), *mklong();
69	double getdouble();
70	long getlong();
71
72	if (argc < 2) {
73	fprintf(stderr, "usage: printf format [arg ...]\n");
74	exit(1);
75	}
76
77	/*
78	* Basic algorithm is to scan the format string for conversion
79	* specifications -- once one is found, find out if the field
80	* width or precision is a '*'; if it is, gather up value. Note,
81	* format strings are reused as necessary to use up the provided
82	* arguments, arguments of zero/null string are provided to use
83	* up the format string.
84	*/
85	skip1 = "#-+ 0";
86	skip2 = "*0123456789";
87
88	escape(fmt = format = ++argv); / backslash interpretation */
89	gargv = ++argv;
90	for (;;) {
91	end = 0;
92	/* find next format specification */
93	next: for (start = fmt;; ++fmt) {
94	if (!*fmt) {
95	/* avoid infinite loop */
96	if (end == 1) {
97	fprintf(stderr,
98	"printf: missing format character.\n");
99	exit(1);
100	}
101	end = 1;
102	if (fmt > start)
103	(void)printf("%s", start);
104	if (!*gargv)
105	exit(0);
106	fmt = format;
107	goto next;
108	}
109	/* %% prints a % */
110	if (*fmt == '%') {
111	if (*++fmt != '%')
112	break;
113	*fmt++ = '\0';
114	(void)printf("%s", start);
115	goto next;
116	}
117	}
118
119	/* skip to field width */
120	for (; index(skip1, *fmt); ++fmt);
121	fieldwidth = fmt == '' ? getint() : 0;
122
123	/* skip to possible '.', get following precision */
124	for (; index(skip2, *fmt); ++fmt);
125	if (*fmt == '.')
126	++fmt;
127	precision = fmt == '' ? getint() : 0;
128
129	/* skip to conversion char */
130	for (; index(skip2, *fmt); ++fmt);
131	if (!*fmt) {
132	fprintf(stderr, "printf: missing format character.\n");
133	exit(1);
134	}
135
136	convch = *fmt;
137	nextch = *++fmt;
138	*fmt = '\0';
139	switch(convch) {
140	case 'c': {
141	char p = getchr();
142	PF(start, p);
143	break;
144	}
145	case 's': {
146	char *p = getstr();
147	PF(start, p);
148	break;
149	}
150	case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
151	char *f = mklong(start, convch);
152	long p = getlong();
153	PF(f, p);
154	break;
155	}
156	case 'e': case 'E': case 'f': case 'g': case 'G': {
157	double p = getdouble();
158	PF(start, p);
159	break;
160	}
161	default:
162	fprintf(stderr, "printf: illegal format character.\n");
163	exit(1);
164	}
165	*fmt = nextch;
166	}
167	/* NOTREACHED */
168	}
169
170	char *
171	mklong(str, ch)
172	char *str, ch;
173	{
174	int len;
175	char copy, malloc();
176
177	len = strlen(str) + 2;
178	if (!(copy = malloc((u_int)len))) { /* never freed; XXX */
179	fprintf(stderr, "printf: out of memory.\n");
180	exit(1);
181	}
182	bcopy(str, copy, len - 3);
183	copy[len - 3] = 'l';
184	copy[len - 2] = ch;
185	copy[len - 1] = '\0';
186	return(copy);
187	}
188
189	escape(fmt)
190	register char *fmt;
191	{
192	register char *store;
193	register int value, c;
194
195	for (store = fmt; c = *fmt; ++fmt, ++store) {
196	if (c != '\\') {
197	*store = c;
198	continue;
199	}
200	switch (*++fmt) {
201	case '\0': /* EOS, user error */
202	*store = '\\';
203	*++store = '\0';
204	return;
205	case '\\': /* backslash */
206	case '\'': /* single quote */
207	store = fmt;
208	break;
209	case 'a': /* bell/alert */
210	*store = '\7';
211	break;
212	case 'b': /* backspace */
213	*store = '\b';
214	break;
215	case 'f': /* form-feed */
216	*store = '\f';
217	break;
218	case 'n': /* newline */
219	*store = '\n';
220	break;
221	case 'r': /* carriage-return */
222	*store = '\r';
223	break;
224	case 't': /* horizontal tab */
225	*store = '\t';
226	break;
227	case 'v': /* vertical tab */
228	*store = '\13';
229	break;
230	/* octal constant */
231	case '0': case '1': case '2': case '3':
232	case '4': case '5': case '6': case '7':
233	for (c = 3, value = 0;
234	c-- && fmt >= '0' && fmt <= '7'; ++fmt) {
235	value <<= 3;
236	value += *fmt - '0';
237	}
238	--fmt;
239	*store = value;
240	break;
241	default:
242	store = fmt;
243	break;
244	}
245	}
246	*store = '\0';
247	}
248
249	getchr()
250	{
251	if (!*gargv)
252	return((int)'\0');
253	return((int)**gargv++);
254	}
255
256	char *
257	getstr()
258	{
259	if (!*gargv)
260	return("");
261	return(*gargv++);
262	}
263
264	static char *number = "+-.0123456789";
265	getint()
266	{
267	if (!*gargv)
268	return(0);
269	if (index(number, **gargv))
270	return(atoi(*gargv++));
271	return(asciicode());
272	}
273
274	long
275	getlong()
276	{
277	long atol();
278
279	if (!*gargv)
280	return((long)0);
281	if (index(number, **gargv))
282	return(strtol(gargv++, (char *)NULL, 0));
283	return((long)asciicode());
284	}
285
286	double
287	getdouble()
288	{
289	double atof();
290
291	if (!*gargv)
292	return((double)0);
293	if (index(number, **gargv))
294	return(atof(*gargv++));
295	return((double)asciicode());
296	}
297
298	asciicode()
299	{
300	register char ch;
301
302	ch = **gargv;
303	if (ch == '\'' \|\| ch == '"')
304	ch = (*gargv)[1];
305	++gargv;
306	return(ch);
307	}