1 /* file.c - describe file type
2 *
3 * Copyright 2016 The Android Open Source Project
4 *
5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/file.html
6
7 USE_FILE(NEWTOY(file, "<1b(brief)hLs[!hL]", TOYFLAG_USR|TOYFLAG_BIN))
8
9 config FILE
10 bool "file"
11 default y
12 help
13 usage: file [-bhLs] [FILE...]
14
15 Examine the given files and describe their content types.
16
17 -b Brief (no filename)
18 -h Don't follow symlinks (default)
19 -L Follow symlinks
20 -s Show block/char device contents
21 */
22
23 #define FOR_file
24 #include "toys.h"
25
GLOBALS(int max_name_len;off_t len;)26 GLOBALS(
27 int max_name_len;
28 off_t len;
29 )
30
31 // We don't trust elf.h to be there, and two codepaths for 32/64 is awkward
32 // anyway, so calculate struct offsets manually. (It's a fixed ABI.)
33 static void do_elf_file(int fd)
34 {
35 unsigned endian = toybuf[5], bits = toybuf[4]-1, i, j, dynamic = 0,
36 stripped = 1, phentsize, phnum, shsize, shnum, bail = 0, arch;
37 long long (*elf_int)(void *ptr, unsigned size) = (endian==2)?peek_be:peek_le;
38 char *map = MAP_FAILED;
39 unsigned long phoff, shoff;
40
41 printf("ELF ");
42
43 // executable type
44 i = elf_int(toybuf+16, 2);
45 if (i == 1) printf("relocatable");
46 else if (i == 2) printf("executable");
47 else if (i == 3) printf("shared object");
48 else if (i == 4) printf("core dump");
49 else {
50 printf("(bad type %d)", i);
51 bail++;
52 }
53 if (elf_int(toybuf+36+12*!!bits, 4) & 0x8000) printf(" (fdpic)");
54 printf(", ");
55
56 // "64-bit"
57 if (bits&~1) {
58 printf("(bad class %d) ", bits);
59 bail++;
60 } else printf("%d-bit ", 32<<bits);
61
62 // "LSB"
63 if (endian == 1) printf("LSB ");
64 else if (endian == 2) printf("MSB ");
65 else {
66 printf("(bad endian %d) ", endian);
67 bail++;
68 }
69
70 // "x86".
71 printf("%s", elf_arch_name(arch = elf_int(toybuf+18, 2)));
72
73 // If what we've seen so far doesn't seem consistent, bail.
74 if (bail) goto bad;
75
76 elf_print_flags(arch, elf_int(toybuf+36+12*bits, 4));
77
78 // Stash what we need from the header; it's okay to reuse toybuf after this.
79 phentsize = elf_int(toybuf+42+12*bits, 2);
80 phnum = elf_int(toybuf+44+12*bits, 2);
81 phoff = elf_int(toybuf+28+4*bits, 4+4*bits);
82 shsize = elf_int(toybuf+46+12*bits, 2);
83 shnum = elf_int(toybuf+48+12*bits, 2);
84 shoff = elf_int(toybuf+32+8*bits, 4+4*bits);
85
86 // With binutils, phentsize seems to only be non-zero if phnum is non-zero.
87 // Such ELF files are rare, but do exist. (Android's crtbegin files, say.)
88 if (phnum && (phentsize != 32+24*bits)) {
89 printf(", bad phentsize %d?", phentsize);
90 goto bad;
91 }
92 if (phoff>TT.len || phnum*phentsize>TT.len-phoff) {
93 printf(", bad phoff %lu?", phoff);
94 goto bad;
95 }
96 if (shoff>TT.len || shnum*shsize>TT.len-shoff) {
97 printf(", bad shoff %lu?", phoff);
98 goto bad;
99 }
100
101 // Parsing ELF means following tables that may point to data earlier in
102 // the file, so sequential reading involves buffering unknown amounts of
103 // data. Just skip it if we can't mmap.
104 if (MAP_FAILED == (map = mmap(0, TT.len, PROT_READ, MAP_SHARED, fd, 0))) {
105 perror_msg("mmap");
106 goto bad;
107 }
108
109 // Read the phdrs for dynamic vs static. (Note: fields reordered on 64 bit)
110 for (i = 0; i<phnum; i++) {
111 char *phdr = map+phoff+i*phentsize;
112 unsigned p_type = elf_int(phdr, 4);
113 unsigned long long p_offset, p_filesz;
114
115 // TODO: what does PT_DYNAMIC without PT_INTERP mean?
116 if (p_type-2>2) continue; // 2 = PT_DYNAMIC, 3 = PT_INTERP, 4 = PT_NOTE
117 dynamic |= p_type==2;
118 p_offset = elf_int(phdr+(4<<bits), 4<<bits);
119 p_filesz = elf_int(phdr+(16<<bits), 4<<bits);
120 if (p_type==3) {
121 if (p_filesz>TT.len || p_offset>TT.len-p_filesz) {
122 printf(", bad phdr %d?", i);
123 goto bad;
124 }
125 // TODO: if (int)<0 prints endlessly, could go off end of map?
126 printf(", dynamic (%.*s)", (int)p_filesz, map+p_offset);
127 }
128 }
129 if (!dynamic) printf(", static");
130
131 // We need to read the shdrs for stripped/unstripped and any notes.
132 // Notes are in program headers *and* section headers, but some files don't
133 // contain program headers, so check here. (Note: fields reordered on 64 bit)
134 for (i = 0; i<shnum; i++) {
135 char *shdr = map+shoff+i*shsize;
136 unsigned long sh_offset;
137 int sh_type, sh_size;
138
139 if (shdr>map+TT.len-(8+(4<<bits))) {
140 printf(", bad shdr %d?", i);
141 goto bad;
142 }
143 sh_type = elf_int(shdr+4, 4);
144 sh_offset = elf_int(shdr+8+(8<<bits), 4<<bits);
145 sh_size = elf_int(shdr+8+(12<<bits), 4);
146 if (sh_type == 8 /*SHT_NOBITS*/) sh_size = 0;
147 if (sh_offset>TT.len || sh_size>TT.len-sh_offset) {
148 printf(", bad shdr %d?", i);
149 goto bad;
150 }
151
152 if (sh_type == 2 /*SHT_SYMTAB*/) {
153 stripped = 0;
154 break;
155 } else if (sh_type == 7 /*SHT_NOTE*/) {
156 char *note = map+sh_offset;
157
158 // An ELF note is a sequence of entries, each consisting of an
159 // ndhr followed by n_namesz+n_descsz bytes of data (each of those
160 // rounded up to the next 4 bytes, without this being reflected in
161 // the header byte counts themselves).
162 while (sh_size >= 3*4) { // Don't try to read a truncated entry.
163 unsigned n_namesz, n_descsz, n_type, notesz;
164
165 if (note>map+TT.len-3*4) {
166 printf(", bad note %d?", i);
167 goto bad;
168 }
169
170 n_namesz = elf_int(note, 4);
171 n_descsz = elf_int(note+4, 4);
172 n_type = elf_int(note+8, 4);
173 notesz = 3*4 + ((n_namesz+3)&~3) + ((n_descsz+3)&~3);
174
175 // Are the name/desc sizes consistent, and does the claimed size of
176 // the note actually fit in the section?
177 if (notesz<n_namesz || notesz<n_descsz || notesz>sh_size) {
178 printf(", bad note %d size?", i);
179 goto bad;
180 }
181
182 if (n_namesz==4 && !smemcmp(note+12, "GNU", 4) && n_type==3) {
183 printf(", BuildID=");
184 for (j = 0; j<n_descsz; j++) printf("%02x", note[16+j]);
185 } else if (n_namesz==8 && !smemcmp(note+12, "Android", 8)) {
186 if (n_type==1 /*.android.note.ident*/ && n_descsz >= 4) {
187 printf(", for Android %d", (int)elf_int(note+20, 4));
188 // NDK r14 and later also include NDK version info. OS binaries
189 // and binaries built by older NDKs don't have this.
190 if (n_descsz >= 4+64+64)
191 printf(", built by NDK %.64s (%.64s)", note+24, note+24+64);
192 }
193 }
194
195 note += notesz;
196 sh_size -= notesz;
197 }
198 }
199 }
200 printf(", %sstripped", stripped ? "" : "not ");
201 bad:
202 xputc('\n');
203
204 if (map != MAP_FAILED) munmap(map, TT.len);
205 }
206
do_regular_file(int fd,char * name)207 static void do_regular_file(int fd, char *name)
208 {
209 char *s = toybuf;
210 unsigned len, magic;
211 int ii;
212
213 // zero through elf shnum, just in case
214 memset(s, 0, 80);
215 if ((len = readall(fd, s, sizeof(toybuf)-8))<0) perror_msg_raw(name);
216
217 if (!len) xputs("empty");
218 // 45 bytes: https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html
219 else if (len>=45 && strstart(&s, "\177ELF")) do_elf_file(fd);
220 else if (strstart(&s, "!<arch>\n")) xputs("ar archive");
221 else if (*s=='%' && 2==sscanf(s, "%%PDF%d.%u", &ii, &magic))
222 xprintf("PDF document, version %d.%u\n", -ii, magic);
223 else if (len>28 && strstart(&s, "\x89PNG\x0d\x0a\x1a\x0a")) {
224 // PNG is big-endian: https://www.w3.org/TR/PNG/#7Integers-and-byte-order
225 int chunk_length = peek_be(s, 4);
226
227 xprintf("PNG image data");
228
229 // The IHDR chunk comes first: https://www.w3.org/TR/PNG/#11IHDR
230 s += 4;
231 if (chunk_length == 13 && strstart(&s, "IHDR")) {
232 // https://www.w3.org/TR/PNG/#6Colour-values
233 char *c = 0, *colors[] = {"grayscale", 0, "color RGB", "indexed color",
234 "grayscale with alpha", 0, "color RGBA"};
235
236 if (s[9]<ARRAY_LEN(colors)) c = colors[s[9]];
237 xprintf(", %d x %d, %d-bit/%s, %sinterlaced", (int)peek_be(s, 4),
238 (int)peek_be(s+4, 4), s[8], c ? : "unknown", s[12] ? "" : "non-");
239 }
240
241 xputc('\n');
242
243 // https://www.w3.org/Graphics/GIF/spec-gif89a.txt
244 } else if (len>16 && (strstart(&s, "GIF87a") || strstart(&s, "GIF89a")))
245 xprintf("GIF image data, version %3.3s, %d x %d\n",
246 s-3, (int)peek_le(s, 2), (int)peek_le(s+2, 2));
247
248 // https://en.wikipedia.org/wiki/JPEG#Syntax_and_structure
249 else if (len>32 && !smemcmp(s, "\xff\xd8", 2)) {
250 char *types[] = {"baseline", "extended sequential", "progressive"};
251 int marker;
252
253 printf("JPEG image data");
254 while (s < toybuf+len-8) { // TODO: refill for files with lots of EXIF data?
255 marker = peek_be(s, 2);
256 if (marker >= 0xffd0 && marker <= 0xffd9) s += 2; // No data.
257 else if (marker >= 0xffc0 && marker <= 0xffc2) {
258 xprintf(", %s, %dx%d", types[marker-0xffc0], (int) peek_be(s+7, 2),
259 (int) peek_be(s+5, 2));
260 break;
261 } else s += peek_be(s + 2, 2) + 2;
262 }
263 xputc('\n');
264
265 } else if (len>8 && strstart(&s, "\xca\xfe\xba\xbe")) {
266 unsigned count = peek_be(s, 4), i, arch;
267
268 // 0xcafebabe can be a Java class file or a Mach-O universal binary.
269 // Java major version numbers start with 0x2d for JDK 1.1, and realistically
270 // you're never going to see more than 2 architectures in a binary anyway...
271 if (count<0x2d && len>=(count*20)) {
272 // https://eclecticlight.co/2020/07/28/universal-binaries-inside-fat-headers/
273 xprintf("Mach-O universal binary with %u architecture%s:",
274 count, count == 1 ? "" : "s");
275 for (i = 0, s += 4; i < count; i++, s += 20) {
276 arch = peek_be(s, 4);
277 if (arch == 0x00000007) name = "i386";
278 else if (arch == 0x01000007) name = "x86_64";
279 else if (arch == 0x0000000c) name = "arm";
280 else if (arch == 0x0100000c) name = "arm64";
281 else name = "unknown";
282 xprintf(" [%s]", name);
283 }
284 xprintf("\n");
285 } else {
286 // https://en.wikipedia.org/wiki/Java_class_file#General_layout
287 xprintf("Java class file, version %d.%d (Java 1.%d)\n",
288 (int)peek_be(s+2, 2), (int)peek_be(s, 2), (int)peek_be(s+2, 2)-44);
289 }
290
291 // https://source.android.com/devices/tech/dalvik/dex-format#dex-file-magic
292 } else if (len>8 && strstart(&s, "dex\n") && !s[3])
293 xprintf("Android dex file, version %s\n", s);
294
295 // https://people.freebsd.org/~kientzle/libarchive/man/cpio.5.txt
296 // the lengths for cpio are size of header + 9 bytes, since any valid
297 // cpio archive ends with a record for "TARGET!!!"
298 else if (len>6 && strstart(&s, "07070")) {
299 char *cpioformat = "unknown type";
300
301 if (*s == '7') cpioformat = "pre-SVR4 or odc";
302 else if (*s == '1') cpioformat = "SVR4 with no CRC";
303 else if (*s == '2') cpioformat = "SVR4 with CRC";
304 xprintf("ASCII cpio archive (%s)\n", cpioformat);
305 } else if (len>33 && ((magic=peek(&s,2))==0143561 || magic==070707)) {
306 if (magic == 0143561) printf("byte-swapped ");
307 xputs("cpio archive");
308 // tar archive (old, ustar/pax, or gnu)
309 } else if (len>500 && is_tar_header(s))
310 xprintf("%s tar archive%s\n", s[257] ? "POSIX" : "old",
311 (s[262]!=' ' || s[263]!=' ')?"":" (GNU)");
312 // zip/jar/apk archive, ODF/OOXML document, or such
313 else if (len>5 && strstart(&s, "PK\03\04")) {
314 xprintf("Zip archive data");
315 if (*s) xprintf(", requires at least v%d.%d to extract", *s/10, *s%10);
316 xputc('\n');
317 } else if (len>9 && strstart(&s, "7z\xbc\xaf\x27\x1c")) {
318 xprintf("7-zip archive data");
319 if (*s || s[1]) xprintf(", version %d.%d", *s, s[1]);
320 xputc('\n');
321 } else if (len>4 && strstart(&s, "BZh") && isdigit(*s))
322 xprintf("bzip2 compressed data, block size = %c00k\n", *s);
323 else if (len>31 && peek_be(s, 7) == 0xfd377a585a0000ULL)
324 xputs("xz compressed data");
325 else if (len>10 && strstart(&s, "\x1f\x8b")) xputs("gzip compressed data");
326 else if (len>32 && !smemcmp(s+1, "\xfa\xed\xfe", 3)) {
327 int bit = (*s==0xce) ? 32 : 64;
328 char *what = 0;
329
330 xprintf("Mach-O %d-bit ", bit);
331
332 if (s[4] == 7) what = (bit==32)?"x86":"x86-";
333 else if (s[4] == 12) what = "arm";
334 else if (s[4] == 18) what = "ppc";
335 if (what) xprintf("%s%s ", what, (bit==32)?"":"64");
336 else xprintf("(bad arch %d) ", s[4]);
337
338 if (s[12] == 1) what = "object";
339 else if (s[12] == 2) what = "executable";
340 else if (s[12] == 6) what = "shared library";
341 else what = NULL;
342 if (what) xprintf("%s\n", what);
343 else xprintf("(bad type %d)\n", s[9]);
344 } else if (len>36 && !smemcmp(s, "OggS\x00\x02", 6)) {
345 xprintf("Ogg data");
346 // https://wiki.xiph.org/MIMETypesCodecs
347 if (!smemcmp(s+28, "CELT ", 8)) xprintf(", celt audio");
348 else if (!smemcmp(s+28, "CMML ", 8)) xprintf(", cmml text");
349 else if (!smemcmp(s+28, "BBCD", 5)) xprintf(", dirac video");
350 else if (!smemcmp(s+28, "\177FLAC", 5)) xprintf(", flac audio");
351 else if (!smemcmp(s+28, "\x8bJNG\r\n\x1a\n", 8)) xprintf(", jng video");
352 else if (!smemcmp(s+28, "\x80kate\0\0", 8)) xprintf(", kate text");
353 else if (!smemcmp(s+28, "OggMIDI", 8)) xprintf(", midi text");
354 else if (!smemcmp(s+28, "\x8aMNG\r\n\x1a\n", 8)) xprintf(", mng video");
355 else if (!smemcmp(s+28, "OpusHead", 8)) xprintf(", opus audio");
356 else if (!smemcmp(s+28, "PCM ", 8)) xprintf(", pcm audio");
357 else if (!smemcmp(s+28, "\x89PNG\r\n\x1a\n", 8)) xprintf(", png video");
358 else if (!smemcmp(s+28, "Speex ", 8)) xprintf(", speex audio");
359 else if (!smemcmp(s+28, "\x80theora", 7)) xprintf(", theora video");
360 else if (!smemcmp(s+28, "\x01vorbis", 7)) xprintf(", vorbis audio");
361 else if (!smemcmp(s+28, "YUV4MPEG", 8)) xprintf(", yuv4mpeg video");
362 xputc('\n');
363 } else if (len>32 && !smemcmp(s, "RIF", 3) && !smemcmp(s+8, "WAVEfmt ", 8)) {
364 // https://en.wikipedia.org/wiki/WAV
365 int le = (s[3] == 'F');
366 int format = le ? peek_le(s+20, 2) : peek_be(s+20, 2);
367 int channels = le ? peek_le(s+22, 2) : peek_be(s+22, 2);
368 int hz = le ? peek_le(s+24, 4) : peek_be(s+24, 4);
369 int bits = le ? peek_le(s+34, 2) : peek_be(s+34, 2);
370
371 xprintf("WAV audio, %s, ", le ? "LE" : "BE");
372 if (bits) xprintf("%d-bit, ", bits);
373 if (channels==1||channels==2) xprintf("%s, ",(channels==1)?"mono":"stereo");
374 else xprintf("%d-channel, ", channels);
375 xprintf("%d Hz, ", hz);
376 // See https://tools.ietf.org/html/rfc2361, though there appear to be bugs
377 // in the RFC. This assumes wikipedia's example files are more correct.
378 if (format == 0x01) xprintf("PCM");
379 else if (format == 0x03) xprintf("IEEE float");
380 else if (format == 0x06) xprintf("A-law");
381 else if (format == 0x07) xprintf("µ-law");
382 else if (format == 0x11) xprintf("ADPCM");
383 else if (format == 0x22) xprintf("Truespeech");
384 else if (format == 0x31) xprintf("GSM");
385 else if (format == 0x55) xprintf("MP3");
386 else if (format == 0x70) xprintf("CELP");
387 else if (format == 0xfffe) xprintf("extensible");
388 else xprintf("unknown format %d", format);
389 xputc('\n');
390 } else if (len>12 && peek_be(s, 4)==0x10000) xputs("TrueType font");
391 else if (len>12 && !smemcmp(s, "ttcf", 5)) {
392 xprintf("TrueType font collection, version %d, %d fonts\n",
393 (int)peek_be(s+4, 2), (int)peek_be(s+8, 4));
394
395 // https://docs.microsoft.com/en-us/typography/opentype/spec/otff
396 } else if (len>12 && strstart(&s, "OTTO")) xputs("OpenType font");
397 else if (strstart(&s, "BC\xc0\xde")) xputs("LLVM IR bitcode");
398 else if (strstart(&s,"-----BEGIN CERTIFICATE-----")) xputs("PEM certificate");
399
400 // https://msdn.microsoft.com/en-us/library/windows/desktop/ms680547(v=vs.85).aspx
401 else if (len>0x70 && !smemcmp(s, "MZ", 2) &&
402 (magic=peek_le(s+0x3c,4))<len-4 && !smemcmp(s+magic, "\x50\x45\0", 4)) {
403
404 // Linux kernel images look like PE files.
405 // https://www.kernel.org/doc/Documentation/arm64/booting.txt
406 // I've only ever seen LE, 4KiB pages, so ignore flags for now.
407 if (!smemcmp(s+0x38, "ARMd", 4)) return xputs("Linux arm64 kernel image");
408 else if (!smemcmp(s+0x202, "HdrS", 4)) {
409 // https://www.kernel.org/doc/Documentation/x86/boot.txt
410 unsigned ver_off = peek_le(s+0x20e, 2);
411
412 xprintf("Linux x86-64 kernel image");
413 if ((0x200 + ver_off) < len) {
414 s += 0x200 + ver_off;
415 } else {
416 if (lseek(fd, ver_off - len + 0x200, SEEK_CUR)<0 ||
417 (len = readall(fd, s, sizeof(toybuf)))<0)
418 return perror_msg_raw(name);
419 }
420 xprintf(", version %s\n", s);
421 return;
422 }
423
424 xprintf("MS PE32%s executable %s", (peek_le(s+magic+24, 2)==0x20b)?"+":"",
425 (peek_le(s+magic+22, 2)&0x2000)?"(DLL) ":"");
426 if (peek_le(s+magic+20, 2)>70) {
427 char *types[] = {0, "native", "GUI", "console", "OS/2", "driver", "CE",
428 "EFI", "EFI boot", "EFI runtime", "EFI ROM", "XBOX", 0, "boot"}, *nn;
429 unsigned type = peek_le(s+magic+92, 2);
430
431 nn = (type<ARRAY_LEN(types)) ? types[type] : 0;
432 xprintf("(%s) ", nn ? : "unknown");
433 }
434 xprintf("x86%s\n", (peek_le(s+magic+4, 2)==0x14c) ? "" : "-64");
435
436 // https://en.wikipedia.org/wiki/BMP_file_format
437 } else if (len>0x32 && !smemcmp(s, "BM", 2) && !peek_be(s+6, 4)) {
438 xprintf("BMP image, %d x %d, %d bpp\n", (int)peek_le(s+18, 4),
439 (int)peek_le(s+22,4), (int)peek_le(s+28, 2));
440
441 // https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/perf.data-file-format.txt
442 } else if (len>=104 && strstart(&s, "PERFILE2")) xputs("Linux perf data");
443
444 // https://android.googlesource.com/platform/system/core/+/master/libsparse/sparse_format.h
445 else if (len>28 && peek_le(s, 4) == 0xed26ff3a) {
446 xprintf("Android sparse image v%d.%d, %d %d-byte blocks (%d chunks)\n",
447 (int)peek_le(s+4, 2), (int)peek_le(s+6, 2), (int)peek_le(s+16, 4),
448 (int)peek_le(s+12, 4), (int)peek_le(s+20, 4));
449
450 // https://android.googlesource.com/platform/system/tools/mkbootimg/+/refs/heads/master/include/bootimg/bootimg.h
451 } else if (len>1632 && !smemcmp(s, "ANDROID!", 8)) {
452 xprintf("Android boot image v%d\n", (int)peek_le(s+40, 4));
453
454 // https://source.android.com/devices/architecture/dto/partitions
455 } else if (len>32 && peek_be(s, 4) == 0xd7b7ab1e) {
456 xprintf("Android DTB/DTBO v%d, %d entries\n", (int)peek_be(s+28, 4),
457 (int)peek_be(s+16, 4));
458
459 // frameworks/base/core/java/com/android/internal/util/BinaryXmlSerializer.java
460 } else if (len>4 && !smemcmp(s, "ABX", 3)) {
461 xprintf("Android Binary XML v%d\n", s[3]);
462
463 // https://webassembly.github.io/spec/core/binary/modules.html#binary-module
464 } else if (len>8 && !smemcmp(s, "\0asm", 4)) {
465 xprintf("wasm binary module version %d\n", (int)peek_le(s+4, 4));
466
467 // Text files, including shell scripts.
468 } else {
469 char *what = 0;
470 int i, bytes;
471
472 // If shell script, report which interpreter
473 if (len>3 && strstart(&s, "#!")) {
474 // Whitespace is allowed between the #! and the interpreter
475 while (isspace(*s)) s++;
476 if (strstart(&s, "/usr/bin/env")) while (isspace(*s)) s++;
477 for (what = s; *s && !isspace(*s); s++);
478 strcpy(s, " script");
479
480 // Distinguish ASCII text, UTF-8 text, or data
481 } else for (i = 0; i<len; ++i) {
482 if (!(isprint(s[i]) || isspace(s[i]))) {
483 unsigned wc;
484
485 if ((bytes = utf8towc(&wc, s+i, len-i))>0 && wcwidth(wc)>=0) {
486 i += bytes-1;
487 if (!what) what = "UTF-8 text";
488 } else {
489 what = "data";
490 break;
491 }
492 }
493 }
494 xputs(what ? what : "ASCII text");
495 }
496 }
497
file_main(void)498 void file_main(void)
499 {
500 char **arg;
501
502 for (arg = toys.optargs; *arg; ++arg)
503 TT.max_name_len = maxof(strlen(*arg), TT.max_name_len);
504
505 // Can't use loopfiles here because it doesn't call function when can't open
506 for (arg = toys.optargs; *arg; arg++) {
507 char *name = *arg, *what = "unknown";
508 struct stat sb;
509 int fd = !strcmp(name, "-");
510
511 if (!FLAG(b))
512 xprintf("%s: %*s", name, (int)(TT.max_name_len - strlen(name)), "");
513
514 sb.st_size = 0;
515 if (!fd && (FLAG(L) ? stat : lstat)(name, &sb)) {
516 xprintf("cannot open: %s\n", strerror(errno));
517
518 continue;
519 }
520
521 if (!fd && !FLAG(s) && (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode))) {
522 sprintf(what = toybuf, "%s special (%u/%u)",
523 S_ISBLK(sb.st_mode) ? "block" : "character",
524 dev_major(sb.st_rdev), dev_minor(sb.st_rdev));
525 } else if (fd || S_ISREG(sb.st_mode)) {
526 TT.len = sb.st_size;
527 // This test identifies an empty file we don't have permission to read
528 if (!fd && !sb.st_size) what = "empty";
529 else if ((fd = openro(name, O_RDONLY)) != -1) {
530 do_regular_file(fd, name);
531 if (fd) close(fd);
532
533 continue;
534 }
535 } else if (S_ISFIFO(sb.st_mode)) what = "fifo";
536 else if (S_ISDIR(sb.st_mode)) what = "directory";
537 else if (S_ISSOCK(sb.st_mode)) what = "socket";
538 else if (S_ISLNK(sb.st_mode)) {
539 char *lnk = xreadlink(name);
540
541 sprintf(what = toybuf, "%ssymbolic link to %s",
542 stat(name, &sb) ? "broken " : "", lnk);
543 free(lnk);
544 }
545 xputs(what);
546 }
547 }
548