[apple/shell_cmds.git] / hexdump / display.c

/*
 * Copyright (c) 1989, 1993
 *	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
#if 0
static char sccsid[] = "@(#)display.c	8.1 (Berkeley) 6/6/93";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/hexdump/display.c,v 1.19 2004/07/11 01:11:12 tjr Exp $");

#include <sys/param.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "hexdump.h"

enum _vflag vflag = FIRST;

static off_t address;			/* address/offset in stream */
static off_t eaddress;			/* end address */

static __inline void print(PR *, u_char *);

void
display(void)
{
	FS *fs;
	FU *fu;
	PR *pr;
	int cnt;
	u_char *bp;
	off_t saveaddress;
	u_char savech=0, *savebp;

	while ((bp = get()))
	    for (fs = fshead, savebp = bp, saveaddress = address; fs;
		fs = fs->nextfs, bp = savebp, address = saveaddress)
		    for (fu = fs->nextfu; fu; fu = fu->nextfu) {
			if (fu->flags&F_IGNORE)
				break;
			for (cnt = fu->reps; cnt; --cnt)
			    for (pr = fu->nextpr; pr; address += pr->bcnt,
				bp += pr->bcnt, pr = pr->nextpr) {
				    if (eaddress && address >= eaddress &&
					!(pr->flags & (F_TEXT|F_BPAD)))
					    bpad(pr);
				    if (cnt == 1 && pr->nospace) {
					savech = *pr->nospace;
					*pr->nospace = '\0';
				    }
				    print(pr, bp);
				    if (cnt == 1 && pr->nospace)
					*pr->nospace = savech;
			    }
		    }
	if (endfu) {
		/*
		 * If eaddress not set, error or file size was multiple of
		 * blocksize, and no partial block ever found.
		 */
		if (!eaddress) {
			if (!address) {
				return;
			}
			eaddress = address;
		}
		for (pr = endfu->nextpr; pr; pr = pr->nextpr)
			switch(pr->flags) {
			case F_ADDRESS:
				(void)printf(pr->fmt, (quad_t)eaddress);
				break;
			case F_TEXT:
				(void)printf("%s", pr->fmt);
				break;
			default:
				break;
			}
	}
}

static __inline void
print(PR *pr, u_char *bp)
{
	long double ldbl;
	   double f8;
	    float f4;
	  int16_t s2;
	   int8_t s8;
	  int32_t s4;
	u_int16_t u2;
	u_int32_t u4;
	u_int64_t u8;

	switch(pr->flags) {
	case F_ADDRESS:
		(void)printf(pr->fmt, (quad_t)address);
		break;
	case F_BPAD:
		(void)printf(pr->fmt, "");
		break;
	case F_C:
		conv_c(pr, bp, eaddress ? eaddress - address :
		    blocksize - address % blocksize);
		break;
	case F_CHAR:
		(void)printf(pr->fmt, *bp);
		break;
	case F_DBL:
		switch(pr->bcnt) {
		case 4:
			bcopy(bp, &f4, sizeof(f4));
			(void)printf(pr->fmt, f4);
			break;
		case 8:
			bcopy(bp, &f8, sizeof(f8));
			(void)printf(pr->fmt, f8);
			break;
		default:
			if (pr->bcnt == sizeof(long double)) {
				bcopy(bp, &ldbl, sizeof(ldbl));
				(void)printf(pr->fmt, ldbl);
			}
			break;
		}
		break;
	case F_INT:
		switch(pr->bcnt) {
		case 1:
			(void)printf(pr->fmt, (quad_t)(signed char)*bp);
			break;
		case 2:
			bcopy(bp, &s2, sizeof(s2));
			(void)printf(pr->fmt, (quad_t)s2);
			break;
		case 4:
			bcopy(bp, &s4, sizeof(s4));
			(void)printf(pr->fmt, (quad_t)s4);
			break;
		case 8:
			bcopy(bp, &s8, sizeof(s8));
			(void)printf(pr->fmt, s8);
			break;
		}
		break;
	case F_P:
		(void)printf(pr->fmt, isprint(*bp) && isascii(*bp) ? *bp : '.');
		break;
	case F_STR:
		(void)printf(pr->fmt, (char *)bp);
		break;
	case F_TEXT:
		(void)printf("%s", pr->fmt);
		break;
	case F_U:
		conv_u(pr, bp);
		break;
	case F_UINT:
		switch(pr->bcnt) {
		case 1:
			(void)printf(pr->fmt, (u_quad_t)*bp);
			break;
		case 2:
			bcopy(bp, &u2, sizeof(u2));
			(void)printf(pr->fmt, (u_quad_t)u2);
			break;
		case 4:
			bcopy(bp, &u4, sizeof(u4));
			(void)printf(pr->fmt, (u_quad_t)u4);
			break;
		case 8:
			bcopy(bp, &u8, sizeof(u8));
			(void)printf(pr->fmt, u8);
			break;
		}
		break;
	}
}

void
bpad(PR *pr)
{
	static char const *spec = " -0+#";
	char *p1, *p2;

	/*
	 * Remove all conversion flags; '-' is the only one valid
	 * with %s, and it's not useful here.
	 */
	pr->flags = F_BPAD;
	pr->cchar[0] = 's';
	pr->cchar[1] = '\0';
	for (p1 = pr->fmt; *p1 != '%'; ++p1);
	for (p2 = ++p1; *p1 && index(spec, *p1); ++p1);
	while ((*p2++ = *p1++));
}

static char **_argv;

u_char *
get(void)
{
	static int ateof = 1;
	static u_char *curp, *savp;
	int n;
	int need, nread;
	int valid_save = 0;
	u_char *tmpp;

	if (!curp) {
		if ((curp = calloc(1, blocksize)) == NULL)
			err(1, NULL);
		if ((savp = calloc(1, blocksize)) == NULL)
			err(1, NULL);
	} else {
		tmpp = curp;
		curp = savp;
		savp = tmpp;
		address += blocksize;
		valid_save = 1;
	}
	for (need = blocksize, nread = 0;;) {
		/*
		 * if read the right number of bytes, or at EOF for one file,
		 * and no other files are available, zero-pad the rest of the
		 * block and set the end flag.
		 */
		if (!length || (ateof && !next((char **)NULL))) {
			if (odmode && address < skip)
				errx(1, "cannot skip past end of input");
			if (need == blocksize)
				return((u_char *)NULL);
			/*
			 * XXX bcmp() is not quite right in the presence
			 * of multibyte characters.
			 */
#ifdef __APPLE__
			/* 5650060 */
			if (!need && vflag != ALL && 
#else
			if (vflag != ALL && 
#endif
			    valid_save && 
			    bcmp(curp, savp, nread) == 0) {
				if (vflag != DUP)
					(void)printf("*\n");
				return((u_char *)NULL);
			}
			bzero((char *)curp + nread, need);
			eaddress = address + nread;
			if (length == 0)
				lseek(STDIN_FILENO, ftell(stdin), SEEK_SET); /* rewind stdin for next process */
			return(curp);
		}
		n = fread((char *)curp + nread, sizeof(u_char),
		    length == -1 ? need : MIN(length, need), stdin);
		if (!n) {
			if (ferror(stdin))
				warn("%s", _argv[-1]);
			ateof = 1;
			continue;
		}
		ateof = 0;
		if (length != -1)
			length -= n;
		if (!(need -= n)) {
			/*
			 * XXX bcmp() is not quite right in the presence
			 * of multibyte characters.
			 */
			if (vflag == ALL || vflag == FIRST ||
			    valid_save == 0 ||
			    bcmp(curp, savp, blocksize) != 0) {
				if (vflag == DUP || vflag == FIRST)
					vflag = WAIT;
				return(curp);
			}
			if (vflag == WAIT)
				(void)printf("*\n");
			vflag = DUP;
			address += blocksize;
			need = blocksize;
			nread = 0;
		}
		else
			nread += n;
	}
}

size_t
peek(u_char *buf, size_t nbytes)
{
	size_t n, nread;
	int c;

	if (length != -1 && nbytes > length)
		nbytes = length;
	nread = 0;
	while (nread < nbytes && (c = getchar()) != EOF) {
		*buf++ = c;
		nread++;
	}
	n = nread;
	while (n-- > 0) {
		c = *--buf;
		ungetc(c, stdin);
	}
	return (nread);
}

int
next(char **argv)
{
	static int done;
	int statok;

	if (argv) {
		_argv = argv;
		return(1);
	}
	for (;;) {
		if (*_argv) {
			if (!(freopen(*_argv, "r", stdin))) {
				warn("%s", *_argv);
				exitval = 1;
				++_argv;
				continue;
			}
			statok = done = 1;
		} else {
			if (done++)
				return(0);
			statok = 0;
		}
		if (skip)
			doskip(statok ? *_argv : "stdin", statok);
		if (*_argv)
			++_argv;
		if (!skip)
			return(1);
	}
	/* NOTREACHED */
}

void
doskip(const char *fname, int statok)
{
	int cnt;
	struct stat sb;

	if (statok) {
		if (fstat(fileno(stdin), &sb))
			err(1, "%s", fname);
		if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
			address += sb.st_size;
			skip -= sb.st_size;
			return;
		}
	}
#ifdef __APPLE__
	/* try to seek first; fall back on ESPIPE */
	if (fseeko(stdin, skip, SEEK_SET) == 0) {
#else /* !__APPLE__ */
	if (S_ISREG(sb.st_mode)) {
		if (fseeko(stdin, skip, SEEK_SET))
			err(1, "%s", fname);
#endif /* __APPLE__ */
		address += skip;
		skip = 0;
	} else {
#ifdef __APPLE__
		if (errno != ESPIPE)
			err(1, "%s", fname);
#endif /* __APPLE__ */
		for (cnt = 0; cnt < skip; ++cnt)
			if (getchar() == EOF)
				break;
		address += cnt;
		skip -= cnt;
	}
}
Commit	Line	Data
1e9ba8f2 A	1	/*
	2	* Copyright (c) 1989, 1993
	3	* The Regents of the University of California. 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	#if 0
	36	static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
	37	#endif
	38	#endif /* not lint */
	39	#include <sys/cdefs.h>
	40	__FBSDID("$FreeBSD: src/usr.bin/hexdump/display.c,v 1.19 2004/07/11 01:11:12 tjr Exp $");
	41
	42	#include <sys/param.h>
	43	#include <sys/stat.h>
	44
	45	#include <ctype.h>
	46	#include <err.h>
	47	#include <errno.h>
	48	#include <stdio.h>
	49	#include <stdlib.h>
	50	#include <string.h>
	51	#include <unistd.h>
	52	#include "hexdump.h"
	53
	54	enum _vflag vflag = FIRST;
	55
	56	static off_t address; /* address/offset in stream */
	57	static off_t eaddress; /* end address */
	58
	59	static __inline void print(PR , u_char );
	60
	61	void
	62	display(void)
	63	{
	64	FS *fs;
65	FU *fu;
66	PR *pr;
67	int cnt;
68	u_char *bp;
69	off_t saveaddress;
70	u_char savech=0, *savebp;
71
72	while ((bp = get()))
73	for (fs = fshead, savebp = bp, saveaddress = address; fs;
74	fs = fs->nextfs, bp = savebp, address = saveaddress)
75	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
76	if (fu->flags&F_IGNORE)
77	break;
78	for (cnt = fu->reps; cnt; --cnt)
79	for (pr = fu->nextpr; pr; address += pr->bcnt,
80	bp += pr->bcnt, pr = pr->nextpr) {
81	if (eaddress && address >= eaddress &&
82	!(pr->flags & (F_TEXT\|F_BPAD)))
83	bpad(pr);
84	if (cnt == 1 && pr->nospace) {
85	savech = *pr->nospace;
86	*pr->nospace = '\0';
87	}
88	print(pr, bp);
89	if (cnt == 1 && pr->nospace)
90	*pr->nospace = savech;
91	}
92	}
93	if (endfu) {
94	/*
95	* If eaddress not set, error or file size was multiple of
96	* blocksize, and no partial block ever found.
97	*/
98	if (!eaddress) {
99	if (!address) {
100	return;
101	}
102	eaddress = address;
103	}
104	for (pr = endfu->nextpr; pr; pr = pr->nextpr)
105	switch(pr->flags) {
106	case F_ADDRESS:
107	(void)printf(pr->fmt, (quad_t)eaddress);
108	break;
109	case F_TEXT:
110	(void)printf("%s", pr->fmt);
111	break;
112	default:
113	break;
114	}
115	}
116	}
117
118	static __inline void
119	print(PR pr, u_char bp)
120	{
121	long double ldbl;
122	double f8;
123	float f4;
124	int16_t s2;
125	int8_t s8;
126	int32_t s4;
127	u_int16_t u2;
128	u_int32_t u4;
129	u_int64_t u8;
130
131	switch(pr->flags) {
132	case F_ADDRESS:
133	(void)printf(pr->fmt, (quad_t)address);
134	break;
135	case F_BPAD:
136	(void)printf(pr->fmt, "");
137	break;
138	case F_C:
139	conv_c(pr, bp, eaddress ? eaddress - address :
140	blocksize - address % blocksize);
141	break;
142	case F_CHAR:
143	(void)printf(pr->fmt, *bp);
144	break;
145	case F_DBL:
146	switch(pr->bcnt) {
147	case 4:
148	bcopy(bp, &f4, sizeof(f4));
149	(void)printf(pr->fmt, f4);
150	break;
151	case 8:
152	bcopy(bp, &f8, sizeof(f8));
153	(void)printf(pr->fmt, f8);
154	break;
155	default:
156	if (pr->bcnt == sizeof(long double)) {
157	bcopy(bp, &ldbl, sizeof(ldbl));
158	(void)printf(pr->fmt, ldbl);
159	}
160	break;
161	}
162	break;
163	case F_INT:
164	switch(pr->bcnt) {
165	case 1:
166	(void)printf(pr->fmt, (quad_t)(signed char)*bp);
167	break;
168	case 2:
169	bcopy(bp, &s2, sizeof(s2));
170	(void)printf(pr->fmt, (quad_t)s2);
171	break;
172	case 4:
173	bcopy(bp, &s4, sizeof(s4));
174	(void)printf(pr->fmt, (quad_t)s4);
175	break;
176	case 8:
177	bcopy(bp, &s8, sizeof(s8));
178	(void)printf(pr->fmt, s8);
179	break;
180	}
181	break;
182	case F_P:
183	(void)printf(pr->fmt, isprint(bp) && isascii(bp) ? *bp : '.');
184	break;
185	case F_STR:
186	(void)printf(pr->fmt, (char *)bp);
187	break;
188	case F_TEXT:
189	(void)printf("%s", pr->fmt);
190	break;
191	case F_U:
192	conv_u(pr, bp);
193	break;
194	case F_UINT:
195	switch(pr->bcnt) {
196	case 1:
197	(void)printf(pr->fmt, (u_quad_t)*bp);
198	break;
199	case 2:
200	bcopy(bp, &u2, sizeof(u2));
201	(void)printf(pr->fmt, (u_quad_t)u2);
202	break;
203	case 4:
204	bcopy(bp, &u4, sizeof(u4));
205	(void)printf(pr->fmt, (u_quad_t)u4);
206	break;
207	case 8:
208	bcopy(bp, &u8, sizeof(u8));
209	(void)printf(pr->fmt, u8);
210	break;
211	}
212	break;
213	}
214	}
215
216	void
217	bpad(PR *pr)
218	{
219	static char const *spec = " -0+#";
220	char p1, p2;
221
222	/*
223	* Remove all conversion flags; '-' is the only one valid
224	* with %s, and it's not useful here.
225	*/
226	pr->flags = F_BPAD;
227	pr->cchar[0] = 's';
228	pr->cchar[1] = '\0';
229	for (p1 = pr->fmt; *p1 != '%'; ++p1);
230	for (p2 = ++p1; p1 && index(spec, p1); ++p1);
231	while ((p2++ = p1++));
232	}
233
234	static char **_argv;
235
236	u_char *
237	get(void)
238	{
239	static int ateof = 1;
240	static u_char curp, savp;
241	int n;
242	int need, nread;
243	int valid_save = 0;
244	u_char *tmpp;
245
246	if (!curp) {
247	if ((curp = calloc(1, blocksize)) == NULL)
248	err(1, NULL);
249	if ((savp = calloc(1, blocksize)) == NULL)
250	err(1, NULL);
251	} else {
252	tmpp = curp;
253	curp = savp;
254	savp = tmpp;
255	address += blocksize;
256	valid_save = 1;
257	}
258	for (need = blocksize, nread = 0;;) {
259	/*
260	* if read the right number of bytes, or at EOF for one file,
261	* and no other files are available, zero-pad the rest of the
262	* block and set the end flag.
263	*/
264	if (!length \|\| (ateof && !next((char **)NULL))) {
265	if (odmode && address < skip)
266	errx(1, "cannot skip past end of input");
267	if (need == blocksize)
268	return((u_char *)NULL);
269	/*
270	* XXX bcmp() is not quite right in the presence
271	* of multibyte characters.
272	*/
57cab491 A	273	#ifdef __APPLE__
	274	/* 5650060 */
	275	if (!need && vflag != ALL &&
	276	#else
1e9ba8f2	277	if (vflag != ALL &&
57cab491	278	#endif
1e9ba8f2 A	279	valid_save &&
	280	bcmp(curp, savp, nread) == 0) {
	281	if (vflag != DUP)
	282	(void)printf("*\n");
	283	return((u_char *)NULL);
	284	}
	285	bzero((char *)curp + nread, need);
	286	eaddress = address + nread;
	287	if (length == 0)
	288	lseek(STDIN_FILENO, ftell(stdin), SEEK_SET); /* rewind stdin for next process */
	289	return(curp);
	290	}
	291	n = fread((char *)curp + nread, sizeof(u_char),
	292	length == -1 ? need : MIN(length, need), stdin);
	293	if (!n) {
	294	if (ferror(stdin))
	295	warn("%s", _argv[-1]);
	296	ateof = 1;
	297	continue;
	298	}
	299	ateof = 0;
	300	if (length != -1)
	301	length -= n;
	302	if (!(need -= n)) {
	303	/*
	304	* XXX bcmp() is not quite right in the presence
	305	* of multibyte characters.
	306	*/
	307	if (vflag == ALL \|\| vflag == FIRST \|\|
	308	valid_save == 0 \|\|
	309	bcmp(curp, savp, blocksize) != 0) {
	310	if (vflag == DUP \|\| vflag == FIRST)
	311	vflag = WAIT;
	312	return(curp);
	313	}
	314	if (vflag == WAIT)
	315	(void)printf("*\n");
	316	vflag = DUP;
	317	address += blocksize;
	318	need = blocksize;
	319	nread = 0;
	320	}
	321	else
	322	nread += n;
	323	}
	324	}
	325
	326	size_t
	327	peek(u_char *buf, size_t nbytes)
	328	{
	329	size_t n, nread;
	330	int c;
	331
	332	if (length != -1 && nbytes > length)
	333	nbytes = length;
	334	nread = 0;
	335	while (nread < nbytes && (c = getchar()) != EOF) {
	336	*buf++ = c;
	337	nread++;
	338	}
	339	n = nread;
	340	while (n-- > 0) {
	341	c = *--buf;
	342	ungetc(c, stdin);
343	}
344	return (nread);
345	}
346
347	int
348	next(char **argv)
349	{
350	static int done;
351	int statok;
352
353	if (argv) {
354	_argv = argv;
355	return(1);
356	}
357	for (;;) {
358	if (*_argv) {
359	if (!(freopen(*_argv, "r", stdin))) {
360	warn("%s", *_argv);
361	exitval = 1;
362	++_argv;
363	continue;
364	}
365	statok = done = 1;
366	} else {
367	if (done++)
368	return(0);
369	statok = 0;
370	}
371	if (skip)
372	doskip(statok ? *_argv : "stdin", statok);
373	if (*_argv)
374	++_argv;
375	if (!skip)
376	return(1);
377	}
378	/* NOTREACHED */
379	}
380
381	void
382	doskip(const char *fname, int statok)
383	{
384	int cnt;
385	struct stat sb;
386
387	if (statok) {
388	if (fstat(fileno(stdin), &sb))
389	err(1, "%s", fname);
390	if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
391	address += sb.st_size;
392	skip -= sb.st_size;
393	return;
394	}
395	}
396	#ifdef __APPLE__
397	/* try to seek first; fall back on ESPIPE */
398	if (fseeko(stdin, skip, SEEK_SET) == 0) {
399	#else /* !__APPLE__ */
400	if (S_ISREG(sb.st_mode)) {
401	if (fseeko(stdin, skip, SEEK_SET))
402	err(1, "%s", fname);
403	#endif /* __APPLE__ */
404	address += skip;
405	skip = 0;
406	} else {
407	#ifdef __APPLE__
408	if (errno != ESPIPE)
409	err(1, "%s", fname);
410	#endif /* __APPLE__ */
411	for (cnt = 0; cnt < skip; ++cnt)
412	if (getchar() == EOF)
413	break;
414	address += cnt;
415	skip -= cnt;
416	}
417	}