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

/* char printf_id[] = "@(#) printf.c:2.2 6/5/79";*/
#include "varargs.h"
/*
 * This version of printf is compatible with the Version 7 C
 * printf. The differences are only minor except that this
 * printf assumes it is to print through putchar. Version 7
 * printf is more general (and is much larger) and includes
 * provisions for floating point.
 */
 

#define MAXOCT	11	/* Maximum octal digits in a long */
#define MAXINT	32767	/* largest normal length positive integer */
#define BIG	1000000000  /* largest power of 10 less than an unsigned long */
#define MAXDIGS	10	/* number of digits in BIG */

static int width, sign, fill;

char *_p_dconv();

printf(va_alist)
	va_dcl
{
	va_list ap;
	register char *fmt;
	char fcode;
	int prec;
	int length,mask1,nbits,n;
	long int mask2, num;
	register char *bptr;
	char *ptr;
	char buf[134];

	va_start(ap);
	fmt = va_arg(ap,char *);
	for (;;) {
		/* process format string first */
		while ((fcode = *fmt++)!='%') {
			/* ordinary (non-%) character */
			if (fcode=='\0')
				return;
			putchar(fcode);
		}
		/* length modifier: -1 for h, 1 for l, 0 for none */
		length = 0;
		/* check for a leading - sign */
		sign = 0;
		if (*fmt == '-') {
			sign++;
			fmt++;
		}
		/* a '0' may follow the - sign */
		/* this is the requested fill character */
		fill = 1;
		if (*fmt == '0') {
			fill--;
			fmt++;
		}
		
		/* Now comes a digit string which may be a '*' */
		if (*fmt == '*') {
			width = va_arg(ap, int);
			if (width < 0) {
				width = -width;
				sign = !sign;
			}
			fmt++;
		}
		else {
			width = 0;
			while (*fmt>='0' && *fmt<='9')
				width = width * 10 + (*fmt++ - '0');
		}
		
		/* maybe a decimal point followed by more digits (or '*') */
		if (*fmt=='.') {
			if (*++fmt == '*') {
				prec = va_arg(ap, int);
				fmt++;
			}
			else {
				prec = 0;
				while (*fmt>='0' && *fmt<='9')
					prec = prec * 10 + (*fmt++ - '0');
			}
		}
		else
			prec = -1;
		
		/*
		 * At this point, "sign" is nonzero if there was
		 * a sign, "fill" is 0 if there was a leading
		 * zero and 1 otherwise, "width" and "prec"
		 * contain numbers corresponding to the digit
		 * strings before and after the decimal point,
		 * respectively, and "fmt" addresses the next
		 * character after the whole mess. If there was
		 * no decimal point, "prec" will be -1.
		 */
		switch (*fmt) {
			case 'L':
			case 'l':
				length = 2;
				/* no break!! */
			case 'h':
			case 'H':
				length--;
				fmt++;
				break;
		}
		
		/*
		 * At exit from the following switch, we will
		 * emit the characters starting at "bptr" and
		 * ending at "ptr"-1, unless fcode is '\0'.
		 */
		switch (fcode = *fmt++) {
			/* process characters and strings first */
			case 'c':
				buf[0] = va_arg(ap, int);
				ptr = bptr = &buf[0];
				if (buf[0] != '\0')
					ptr++;
				break;
			case 's':
				bptr = va_arg(ap,char *);
				if (bptr==0)
					bptr = "(null pointer)";
				if (prec < 0)
					prec = MAXINT;
				for (n=0; *bptr++ && n < prec; n++) ;
				ptr = --bptr;
				bptr -= n;
				break;
			case 'O':
				length = 1;
				fcode = 'o';
				/* no break */
			case 'o':
			case 'X':
			case 'x':
				if (length > 0)
					num = va_arg(ap,long);
				else
					num = (unsigned)va_arg(ap,int);
				if (fcode=='o') {
					mask1 = 0x7;
					mask2 = 0x1fffffffL;
					nbits = 3;
				}
				else {
					mask1 = 0xf;
					mask2 = 0x0fffffffL;
					nbits = 4;
				}
				n = (num!=0);
				bptr = buf + MAXOCT + 3;
				/* shift and mask for speed */
				do
				    if (((int) num & mask1) < 10)
					*--bptr = ((int) num & mask1) + 060;
				    else
					*--bptr = ((int) num & mask1) + 0127;
				while (num = (num >> nbits) & mask2);
				
				if (fcode=='o') {
					if (n)
						*--bptr = '0';
				}
				else
					if (!sign && fill <= 0) {
						putchar('0');
						putchar(fcode);
						width -= 2;
					}
					else {
						*--bptr = fcode;
						*--bptr = '0';
					}
				ptr = buf + MAXOCT + 3;
				break;
			case 'D':
			case 'U':
			case 'I':
				length = 1;
				fcode = fcode + 'a' - 'A';
				/* no break */
			case 'd':
			case 'i':
			case 'u':
				if (length > 0)
					num = va_arg(ap,long);
				else {
					n = va_arg(ap,int);
					if (fcode=='u')
						num = (unsigned) n;
					else
						num = (long) n;
				}
				if (n = (fcode != 'u' && num < 0))
					num = -num;
				/* now convert to digits */
				bptr = _p_dconv(num, buf);
				if (n)
					*--bptr = '-';
				if (fill == 0)
					fill = -1;
				ptr = buf + MAXDIGS + 1;
				break;
			default:
				/* not a control character, 
				 * print it.
				 */
				ptr = bptr = &fcode;
				ptr++;
				break;
			}
			if (fcode != '\0')
				_p_emit(bptr,ptr);
	}
	va_end(ap);
}

/* _p_dconv converts the unsigned long integer "value" to
 * printable decimal and places it in "buffer", right-justified.
 * The value returned is the address of the first non-zero character,
 * or the address of the last character if all are zero.
 * The result is NOT null terminated, and is MAXDIGS characters long,
 * starting at buffer[1] (to allow for insertion of a sign).
 *
 * This program assumes it is running on 2's complement machine
 * with reasonable overflow treatment.
 */
char *
_p_dconv(value, buffer)
	long value;
	char *buffer;
{
	register char *bp;
	register int svalue;
	int n;
	long lval;
	
	bp = buffer;
	
	/* zero is a special case */
	if (value == 0) {
		bp += MAXDIGS;
		*bp = '0';
		return(bp);
	}
	
	/* develop the leading digit of the value in "n" */
	n = 0;
	while (value < 0) {
		value -= BIG;	/* will eventually underflow */
		n++;
	}
	while ((lval = value - BIG) >= 0) {
		value = lval;
		n++;
	}
	
	/* stash it in buffer[1] to allow for a sign */
	bp[1] = n + '0';
	/*
	 * Now develop the rest of the digits. Since speed counts here,
	 * we do it in two loops. The first gets "value" down until it
	 * is no larger than MAXINT. The second one uses integer divides
	 * rather than long divides to speed it up.
	 */
	bp += MAXDIGS + 1;
	while (value > MAXINT) {
		*--bp = (int)(value % 10) + '0';
		value /= 10;
	}
	
	/* cannot lose precision */
	svalue = value;
	while (svalue > 0) {
		*--bp = (svalue % 10) + '0';
		svalue /= 10;
	}
	
	/* fill in intermediate zeroes if needed */
	if (buffer[1] != '0') {
		while (bp > buffer + 2)
			*--bp = '0';
		--bp;
	}
	return(bp);
}

/*
 * This program sends string "s" to putchar. The character after
 * the end of "s" is given by "send". This allows the size of the
 * field to be computed; it is stored in "alen". "width" contains the
 * user specified length. If width<alen, the width will be taken to
 * be alen. "sign" is zero if the string is to be right-justified
 * in the field, nonzero if it is to be left-justified. "fill" is
 * 0 if the string is to be padded with '0', positive if it is to be
 * padded with ' ', and negative if an initial '-' should appear before
 * any padding in right-justification (to avoid printing "-3" as
 * "000-3" where "-0003" was intended).
 */
_p_emit(s, send)
	register char *s;
	char *send;
{
	char cfill;
	register int alen;
	int npad;
	
	alen = send - s;
	if (alen > width)
		width = alen;
	cfill = fill>0? ' ': '0';
	
	/* we may want to print a leading '-' before anything */
	if (*s == '-' && fill < 0) {
		putchar(*s++);
		alen--;
		width--;
	}
	npad = width - alen;
	
	/* emit any leading pad characters */
	if (!sign)
		while (--npad >= 0)
			putchar(cfill);
			
	/* emit the string itself */
	while (--alen >= 0)
		putchar(*s++);
		
	/* emit trailing pad characters */
	if (sign)
		while (--npad >= 0)
			putchar(cfill);
}
Commit	Line	Data
5f4b8e7a MH	1	/* char printf_id[] = "@(#) printf.c:2.2 6/5/79";*/
	2	#include "varargs.h"
	3	/*
	4	* This version of printf is compatible with the Version 7 C
	5	* printf. The differences are only minor except that this
	6	* printf assumes it is to print through putchar. Version 7
	7	* printf is more general (and is much larger) and includes
	8	* provisions for floating point.
	9	*/
	10
	11
	12	#define MAXOCT 11 /* Maximum octal digits in a long */
	13	#define MAXINT 32767 /* largest normal length positive integer */
	14	#define BIG 1000000000 /* largest power of 10 less than an unsigned long */
	15	#define MAXDIGS 10 /* number of digits in BIG */
	16
	17	static int width, sign, fill;
	18
	19	char *_p_dconv();
	20
	21	printf(va_alist)
	22	va_dcl
	23	{
	24	va_list ap;
	25	register char *fmt;
	26	char fcode;
	27	int prec;
	28	int length,mask1,nbits,n;
	29	long int mask2, num;
	30	register char *bptr;
	31	char *ptr;
	32	char buf[134];
	33
	34	va_start(ap);
	35	fmt = va_arg(ap,char *);
	36	for (;;) {
	37	/* process format string first */
	38	while ((fcode = *fmt++)!='%') {
	39	/* ordinary (non-%) character */
	40	if (fcode=='\0')
	41	return;
	42	putchar(fcode);
	43	}
	44	/* length modifier: -1 for h, 1 for l, 0 for none */
	45	length = 0;
	46	/* check for a leading - sign */
	47	sign = 0;
	48	if (*fmt == '-') {
	49	sign++;
	50	fmt++;
	51	}
	52	/* a '0' may follow the - sign */
	53	/* this is the requested fill character */
	54	fill = 1;
	55	if (*fmt == '0') {
	56	fill--;
	57	fmt++;
	58	}
	59
	60	/* Now comes a digit string which may be a '' /
	61	if (fmt == '') {
	62	width = va_arg(ap, int);
	63	if (width < 0) {
	64	width = -width;
65	sign = !sign;
66	}
67	fmt++;
68	}
69	else {
70	width = 0;
71	while (fmt>='0' && fmt<='9')
72	width = width * 10 + (*fmt++ - '0');
73	}
74
75	/* maybe a decimal point followed by more digits (or '') /
76	if (*fmt=='.') {
77	if (++fmt == '') {
78	prec = va_arg(ap, int);
79	fmt++;
80	}
81	else {
82	prec = 0;
83	while (fmt>='0' && fmt<='9')
84	prec = prec * 10 + (*fmt++ - '0');
85	}
86	}
87	else
88	prec = -1;
89
90	/*
91	* At this point, "sign" is nonzero if there was
92	* a sign, "fill" is 0 if there was a leading
93	* zero and 1 otherwise, "width" and "prec"
94	* contain numbers corresponding to the digit
95	* strings before and after the decimal point,
96	* respectively, and "fmt" addresses the next
97	* character after the whole mess. If there was
98	* no decimal point, "prec" will be -1.
99	*/
100	switch (*fmt) {
101	case 'L':
102	case 'l':
103	length = 2;
104	/* no break!! */
105	case 'h':
106	case 'H':
107	length--;
108	fmt++;
109	break;
110	}
111
112	/*
113	* At exit from the following switch, we will
114	* emit the characters starting at "bptr" and
115	* ending at "ptr"-1, unless fcode is '\0'.
116	*/
117	switch (fcode = *fmt++) {
118	/* process characters and strings first */
119	case 'c':
120	buf[0] = va_arg(ap, int);
121	ptr = bptr = &buf[0];
122	if (buf[0] != '\0')
123	ptr++;
124	break;
125	case 's':
126	bptr = va_arg(ap,char *);
127	if (bptr==0)
128	bptr = "(null pointer)";
129	if (prec < 0)
130	prec = MAXINT;
131	for (n=0; *bptr++ && n < prec; n++) ;
132	ptr = --bptr;
133	bptr -= n;
134	break;
135	case 'O':
136	length = 1;
137	fcode = 'o';
138	/* no break */
139	case 'o':
140	case 'X':
141	case 'x':
142	if (length > 0)
143	num = va_arg(ap,long);
144	else
145	num = (unsigned)va_arg(ap,int);
146	if (fcode=='o') {
147	mask1 = 0x7;
148	mask2 = 0x1fffffffL;
149	nbits = 3;
150	}
151	else {
152	mask1 = 0xf;
153	mask2 = 0x0fffffffL;
154	nbits = 4;
155	}
156	n = (num!=0);
157	bptr = buf + MAXOCT + 3;
158	/* shift and mask for speed */
159	do
160	if (((int) num & mask1) < 10)
161	*--bptr = ((int) num & mask1) + 060;
162	else
163	*--bptr = ((int) num & mask1) + 0127;
164	while (num = (num >> nbits) & mask2);
165
166	if (fcode=='o') {
167	if (n)
168	*--bptr = '0';
169	}
170	else
171	if (!sign && fill <= 0) {
172	putchar('0');
173	putchar(fcode);
174	width -= 2;
175	}
176	else {
177	*--bptr = fcode;
178	*--bptr = '0';
179	}
180	ptr = buf + MAXOCT + 3;
181	break;
182	case 'D':
183	case 'U':
184	case 'I':
185	length = 1;
186	fcode = fcode + 'a' - 'A';
187	/* no break */
188	case 'd':
189	case 'i':
190	case 'u':
191	if (length > 0)
192	num = va_arg(ap,long);
193	else {
194	n = va_arg(ap,int);
195	if (fcode=='u')
196	num = (unsigned) n;
197	else
198	num = (long) n;
199	}
200	if (n = (fcode != 'u' && num < 0))
201	num = -num;
202	/* now convert to digits */
203	bptr = _p_dconv(num, buf);
204	if (n)
205	*--bptr = '-';
206	if (fill == 0)
207	fill = -1;
208	ptr = buf + MAXDIGS + 1;
209	break;
210	default:
211	/* not a control character,
212	* print it.
213	*/
214	ptr = bptr = &fcode;
215	ptr++;
216	break;
217	}
218	if (fcode != '\0')
219	_p_emit(bptr,ptr);
220	}
221	va_end(ap);
222	}
223
224	/* _p_dconv converts the unsigned long integer "value" to
225	* printable decimal and places it in "buffer", right-justified.
226	* The value returned is the address of the first non-zero character,
227	* or the address of the last character if all are zero.
228	* The result is NOT null terminated, and is MAXDIGS characters long,
229	* starting at buffer[1] (to allow for insertion of a sign).
230	*
231	* This program assumes it is running on 2's complement machine
232	* with reasonable overflow treatment.
233	*/
234	char *
235	_p_dconv(value, buffer)
236	long value;
237	char *buffer;
238	{
239	register char *bp;
240	register int svalue;
241	int n;
242	long lval;
243
244	bp = buffer;
245
246	/* zero is a special case */
247	if (value == 0) {
248	bp += MAXDIGS;
249	*bp = '0';
250	return(bp);
251	}
252
253	/* develop the leading digit of the value in "n" */
254	n = 0;
255	while (value < 0) {
256	value -= BIG; /* will eventually underflow */
257	n++;
258	}
259	while ((lval = value - BIG) >= 0) {
260	value = lval;
261	n++;
262	}
263
264	/* stash it in buffer[1] to allow for a sign */
265	bp[1] = n + '0';
266	/*
267	* Now develop the rest of the digits. Since speed counts here,
268	* we do it in two loops. The first gets "value" down until it
269	* is no larger than MAXINT. The second one uses integer divides
270	* rather than long divides to speed it up.
271	*/
272	bp += MAXDIGS + 1;
273	while (value > MAXINT) {
274	*--bp = (int)(value % 10) + '0';
275	value /= 10;
276	}
277
278	/* cannot lose precision */
279	svalue = value;
280	while (svalue > 0) {
281	*--bp = (svalue % 10) + '0';
282	svalue /= 10;
283	}
284
285	/* fill in intermediate zeroes if needed */
286	if (buffer[1] != '0') {
287	while (bp > buffer + 2)
288	*--bp = '0';
289	--bp;
290	}
291	return(bp);
292	}
293
294	/*
295	* This program sends string "s" to putchar. The character after
296	* the end of "s" is given by "send". This allows the size of the
297	* field to be computed; it is stored in "alen". "width" contains the
298	* user specified length. If width<alen, the width will be taken to
299	* be alen. "sign" is zero if the string is to be right-justified
300	* in the field, nonzero if it is to be left-justified. "fill" is
301	* 0 if the string is to be padded with '0', positive if it is to be
302	* padded with ' ', and negative if an initial '-' should appear before
303	* any padding in right-justification (to avoid printing "-3" as
304	* "000-3" where "-0003" was intended).
305	*/
306	_p_emit(s, send)
307	register char *s;
308	char *send;
309	{
310	char cfill;
311	register int alen;
312	int npad;
313
314	alen = send - s;
315	if (alen > width)
316	width = alen;
317	cfill = fill>0? ' ': '0';
318
319	/* we may want to print a leading '-' before anything */
320	if (*s == '-' && fill < 0) {
321	putchar(*s++);
322	alen--;
323	width--;
324	}
325	npad = width - alen;
326
327	/* emit any leading pad characters */
328	if (!sign)
329	while (--npad >= 0)
330	putchar(cfill);
331
332	/* emit the string itself */
333	while (--alen >= 0)
334	putchar(*s++);
335
336	/* emit trailing pad characters */
337	if (sign)
338	while (--npad >= 0)
339	putchar(cfill);
340	}