Annotation of src/usr.bin/sed/main.c, Revision 1.36
1.36 ! millert 1: /* $OpenBSD: main.c,v 1.35 2017/08/01 18:05:53 martijn Exp $ */
1.3 deraadt 2:
1.1 deraadt 3: /*-
4: * Copyright (c) 1992 Diomidis Spinellis.
5: * Copyright (c) 1992, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Diomidis Spinellis of Imperial College, University of London.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.8 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <sys/types.h>
1.24 deraadt 37: #include <sys/ioctl.h>
1.19 jasper 38: #include <sys/stat.h>
1.1 deraadt 39:
40: #include <ctype.h>
41: #include <errno.h>
42: #include <fcntl.h>
1.15 millert 43: #include <limits.h>
1.1 deraadt 44: #include <regex.h>
45: #include <stddef.h>
46: #include <stdio.h>
47: #include <stdlib.h>
48: #include <string.h>
49: #include <unistd.h>
1.19 jasper 50: #include <libgen.h>
1.1 deraadt 51:
52: #include "defs.h"
53: #include "extern.h"
54:
55: /*
56: * Linked list of units (strings and files) to be compiled
57: */
58: struct s_compunit {
59: struct s_compunit *next;
60: enum e_cut {CU_FILE, CU_STRING} type;
61: char *s; /* Pointer to string or fname */
62: };
63:
64: /*
65: * Linked list pointer to compilation units and pointer to current
66: * next pointer.
67: */
68: static struct s_compunit *script, **cu_nextp = &script;
69:
70: /*
71: * Linked list of files to be processed
72: */
73: struct s_flist {
74: char *fname;
75: struct s_flist *next;
76: };
77:
78: /*
79: * Linked list pointer to files and pointer to current
80: * next pointer.
81: */
82: static struct s_flist *files, **fl_nextp = &files;
83:
1.19 jasper 84: FILE *infile; /* Current input file */
85: FILE *outfile; /* Current output file */
86:
1.16 djm 87: int Eflag, aflag, eflag, nflag;
1.19 jasper 88: static int rval; /* Exit status */
1.1 deraadt 89:
90: /*
91: * Current file and line number; line numbers restart across compilation
1.19 jasper 92: * units, but span across input files. The latter is optional if editing
93: * in place.
1.1 deraadt 94: */
1.19 jasper 95: const char *fname; /* File name. */
96: const char *outfname; /* Output file name */
97: static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
98: static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
99: char *inplace; /* Inplace edit file extension */
1.1 deraadt 100: u_long linenum;
101:
1.6 millert 102: static void add_compunit(enum e_cut, char *);
103: static void add_file(char *);
1.21 jasper 104: static int next_files_have_lines(void);
1.1 deraadt 105:
1.24 deraadt 106: int termwidth;
107:
1.35 martijn 108: int pledge_wpath, pledge_rpath;
109:
1.1 deraadt 110: int
1.9 deraadt 111: main(int argc, char *argv[])
1.1 deraadt 112: {
1.24 deraadt 113: struct winsize win;
1.1 deraadt 114: int c, fflag;
1.24 deraadt 115: char *p;
1.1 deraadt 116:
117: fflag = 0;
1.19 jasper 118: inplace = NULL;
119: while ((c = getopt(argc, argv, "Eae:f:i::nru")) != -1)
1.1 deraadt 120: switch (c) {
1.16 djm 121: case 'E':
122: case 'r':
123: Eflag = 1;
124: break;
1.1 deraadt 125: case 'a':
126: aflag = 1;
127: break;
128: case 'e':
129: eflag = 1;
130: add_compunit(CU_STRING, optarg);
131: break;
132: case 'f':
133: fflag = 1;
134: add_compunit(CU_FILE, optarg);
135: break;
1.19 jasper 136: case 'i':
137: inplace = optarg ? optarg : "";
138: break;
1.1 deraadt 139: case 'n':
140: nflag = 1;
141: break;
1.11 ray 142: case 'u':
1.18 millert 143: setvbuf(stdout, NULL, _IOLBF, 0);
1.11 ray 144: break;
1.1 deraadt 145: default:
146: case '?':
147: (void)fprintf(stderr,
1.22 jmc 148: "usage: sed [-aEnru] [-i[extension]] command [file ...]\n"
149: " sed [-aEnru] [-e command] [-f command_file] [-i[extension]] [file ...]\n");
1.1 deraadt 150: exit(1);
151: }
152: argc -= optind;
153: argv += optind;
1.24 deraadt 154:
1.32 bentley 155: termwidth = 0;
156: if ((p = getenv("COLUMNS")) != NULL)
1.24 deraadt 157: termwidth = strtonum(p, 0, INT_MAX, NULL);
1.32 bentley 158: if (termwidth == 0 && ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
1.24 deraadt 159: win.ws_col > 0)
160: termwidth = win.ws_col;
161: if (termwidth == 0)
1.32 bentley 162: termwidth = 80;
1.25 deraadt 163:
164: if (inplace != NULL) {
1.33 semarie 165: if (pledge("stdio rpath wpath cpath fattr chown", NULL) == -1)
1.30 jca 166: error(FATAL, "pledge: %s", strerror(errno));
1.25 deraadt 167: } else {
1.27 deraadt 168: if (pledge("stdio rpath wpath cpath", NULL) == -1)
1.30 jca 169: error(FATAL, "pledge: %s", strerror(errno));
1.25 deraadt 170: }
1.1 deraadt 171:
172: /* First usage case; script is the first arg */
173: if (!eflag && !fflag && *argv) {
174: add_compunit(CU_STRING, *argv);
175: argv++;
176: }
177:
178: compile();
179:
180: /* Continue with first and start second usage */
1.35 martijn 181: if (*argv) {
182: if (!pledge_wpath && inplace == NULL) {
183: if (pledge("stdio rpath", NULL) == -1)
184: error(FATAL, "pledge: %s", strerror(errno));
185: }
1.1 deraadt 186: for (; *argv; argv++)
187: add_file(*argv);
1.35 martijn 188: } else {
189: if (!pledge_wpath && !pledge_rpath) {
190: if (pledge("stdio", NULL) == -1)
191: error(FATAL, "pledge: %s", strerror(errno));
192: } else if (pledge_rpath) {
193: if (pledge("stdio rpath", NULL) == -1)
194: error(FATAL, "pledge: %s", strerror(errno));
195: } else if (pledge_wpath) {
196: if (pledge("stdio wpath cpath", NULL) == -1)
197: error(FATAL, "pledge: %s", strerror(errno));
198: }
1.1 deraadt 199: add_file(NULL);
1.35 martijn 200: }
1.1 deraadt 201: process();
202: cfclose(prog, NULL);
203: if (fclose(stdout))
1.29 mmcc 204: error(FATAL, "stdout: %s", strerror(errno));
1.19 jasper 205: exit (rval);
1.1 deraadt 206: }
207:
208: /*
209: * Like fgets, but go through the chain of compilation units chaining them
210: * together. Empty strings and files are ignored.
211: */
212: char *
1.15 millert 213: cu_fgets(char **outbuf, size_t *outsize)
1.1 deraadt 214: {
215: static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
216: static FILE *f; /* Current open file */
217: static char *s; /* Current pointer inside string */
218: static char string_ident[30];
1.13 millert 219: size_t len;
1.1 deraadt 220: char *p;
221:
1.15 millert 222: if (*outbuf == NULL)
223: *outsize = 0;
224:
1.1 deraadt 225: again:
226: switch (state) {
227: case ST_EOF:
228: if (script == NULL)
229: return (NULL);
230: linenum = 0;
231: switch (script->type) {
232: case CU_FILE:
233: if ((f = fopen(script->s, "r")) == NULL)
1.29 mmcc 234: error(FATAL,
1.1 deraadt 235: "%s: %s", script->s, strerror(errno));
236: fname = script->s;
237: state = ST_FILE;
238: goto again;
239: case CU_STRING:
1.36 ! millert 240: len = snprintf(string_ident, sizeof(string_ident),
! 241: "\"%s\"", script->s);
! 242: if (len >= sizeof(string_ident))
1.7 deraadt 243: strlcpy(string_ident +
244: sizeof(string_ident) - 6, " ...\"", 5);
1.1 deraadt 245: fname = string_ident;
246: s = script->s;
247: state = ST_STRING;
248: goto again;
249: }
250: case ST_FILE:
1.13 millert 251: if ((p = fgetln(f, &len)) != NULL) {
1.1 deraadt 252: linenum++;
1.15 millert 253: if (len >= *outsize) {
1.13 millert 254: free(*outbuf);
1.15 millert 255: *outsize = ROUNDLEN(len + 1);
256: *outbuf = xmalloc(*outsize);
1.13 millert 257: }
258: memcpy(*outbuf, p, len);
259: (*outbuf)[len] = '\0';
260: if (linenum == 1 && p[0] == '#' && p[1] == 'n')
1.1 deraadt 261: nflag = 1;
1.13 millert 262: return (*outbuf);
1.1 deraadt 263: }
264: script = script->next;
265: (void)fclose(f);
266: state = ST_EOF;
267: goto again;
268: case ST_STRING:
269: if (linenum == 0 && s[0] == '#' && s[1] == 'n')
270: nflag = 1;
1.13 millert 271: p = *outbuf;
1.15 millert 272: len = *outsize;
1.1 deraadt 273: for (;;) {
1.15 millert 274: if (len <= 1) {
275: *outbuf = xrealloc(*outbuf,
276: *outsize + _POSIX2_LINE_MAX);
277: p = *outbuf + *outsize - len;
278: len += _POSIX2_LINE_MAX;
279: *outsize += _POSIX2_LINE_MAX;
1.1 deraadt 280: }
281: switch (*s) {
282: case '\0':
283: state = ST_EOF;
284: if (s == script->s) {
285: script = script->next;
286: goto again;
287: } else {
288: script = script->next;
289: *p = '\0';
290: linenum++;
1.13 millert 291: return (*outbuf);
1.1 deraadt 292: }
293: case '\n':
294: *p++ = '\n';
295: *p = '\0';
296: s++;
297: linenum++;
1.13 millert 298: return (*outbuf);
1.1 deraadt 299: default:
300: *p++ = *s++;
1.15 millert 301: len--;
1.1 deraadt 302: }
303: }
304: }
1.34 krw 305:
306: return (NULL);
1.1 deraadt 307: }
308:
309: /*
310: * Like fgets, but go through the list of files chaining them together.
311: * Set len to the length of the line.
312: */
313: int
1.9 deraadt 314: mf_fgets(SPACE *sp, enum e_spflag spflag)
1.1 deraadt 315: {
1.19 jasper 316: struct stat sb;
1.1 deraadt 317: size_t len;
1.2 deraadt 318: char *p;
1.19 jasper 319: int c, fd;
320: static int firstfile;
321:
322: if (infile == NULL) {
323: /* stdin? */
324: if (files->fname == NULL) {
325: if (inplace != NULL)
1.29 mmcc 326: error(FATAL, "-i may not be used with stdin");
1.19 jasper 327: infile = stdin;
328: fname = "stdin";
329: outfile = stdout;
330: outfname = "stdout";
331: }
332:
333: firstfile = 1;
334: }
1.1 deraadt 335:
1.19 jasper 336: for (;;) {
337: if (infile != NULL && (c = getc(infile)) != EOF) {
338: (void)ungetc(c, infile);
339: break;
340: }
341: /* If we are here then either eof or no files are open yet */
342: if (infile == stdin) {
343: sp->len = 0;
344: return (0);
345: }
346: if (infile != NULL) {
347: fclose(infile);
348: if (*oldfname != '\0') {
349: if (rename(fname, oldfname) != 0) {
1.34 krw 350: warning("rename()");
1.19 jasper 351: unlink(tmpfname);
352: exit(1);
353: }
354: *oldfname = '\0';
1.1 deraadt 355: }
1.19 jasper 356: if (*tmpfname != '\0') {
357: if (outfile != NULL && outfile != stdout)
358: fclose(outfile);
359: outfile = NULL;
360: rename(tmpfname, fname);
361: *tmpfname = '\0';
1.1 deraadt 362: }
1.19 jasper 363: outfname = NULL;
364: }
365: if (firstfile == 0)
366: files = files->next;
367: else
368: firstfile = 0;
369: if (files == NULL) {
370: sp->len = 0;
371: return (0);
372: }
373: fname = files->fname;
374: if (inplace != NULL) {
375: if (lstat(fname, &sb) != 0)
1.30 jca 376: error(FATAL, "%s: %s", fname,
1.23 sthen 377: strerror(errno ? errno : EIO));
1.19 jasper 378: if (!S_ISREG(sb.st_mode))
1.29 mmcc 379: error(FATAL, "%s: %s %s", fname,
1.19 jasper 380: "in-place editing only",
381: "works for regular files");
382: if (*inplace != '\0') {
383: strlcpy(oldfname, fname,
384: sizeof(oldfname));
385: len = strlcat(oldfname, inplace,
386: sizeof(oldfname));
387: if (len > sizeof(oldfname))
1.29 mmcc 388: error(FATAL, "%s: name too long", fname);
1.1 deraadt 389: }
1.19 jasper 390: len = snprintf(tmpfname, sizeof(tmpfname), "%s/sedXXXXXXXXXX",
391: dirname(fname));
392: if (len >= sizeof(tmpfname))
1.29 mmcc 393: error(FATAL, "%s: name too long", fname);
1.19 jasper 394: if ((fd = mkstemp(tmpfname)) == -1)
1.31 tb 395: error(FATAL, "%s: %s", fname, strerror(errno));
1.19 jasper 396: if ((outfile = fdopen(fd, "w")) == NULL) {
397: unlink(tmpfname);
1.29 mmcc 398: error(FATAL, "%s", fname);
1.19 jasper 399: }
400: fchown(fileno(outfile), sb.st_uid, sb.st_gid);
401: fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
402: outfname = tmpfname;
403: linenum = 0;
404: resetranges();
405: } else {
406: outfile = stdout;
407: outfname = "stdout";
408: }
409: if ((infile = fopen(fname, "r")) == NULL) {
1.34 krw 410: warning("%s", strerror(errno));
1.19 jasper 411: rval = 1;
412: continue;
1.1 deraadt 413: }
414: }
415:
416: /*
1.19 jasper 417: * We are here only when infile is open and we still have something
418: * to read from it.
419: *
1.1 deraadt 420: * Use fgetln so that we can handle essentially infinite input data.
421: * Can't use the pointer into the stdio buffer as the process space
422: * because the ungetc() can cause it to move.
423: */
1.19 jasper 424: p = fgetln(infile, &len);
425: if (ferror(infile))
1.29 mmcc 426: error(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO));
1.19 jasper 427: if (len != 0 && p[len - 1] == '\n') {
428: sp->append_newline = 1;
429: len--;
430: } else if (!lastline()) {
431: sp->append_newline = 1;
432: } else {
433: sp->append_newline = 0;
434: }
1.1 deraadt 435: cspace(sp, p, len, spflag);
436:
437: linenum++;
1.19 jasper 438:
1.1 deraadt 439: return (1);
440: }
441:
442: /*
443: * Add a compilation unit to the linked list
444: */
445: static void
1.9 deraadt 446: add_compunit(enum e_cut type, char *s)
1.1 deraadt 447: {
448: struct s_compunit *cu;
449:
450: cu = xmalloc(sizeof(struct s_compunit));
451: cu->type = type;
452: cu->s = s;
453: cu->next = NULL;
454: *cu_nextp = cu;
455: cu_nextp = &cu->next;
456: }
457:
458: /*
459: * Add a file to the linked list
460: */
461: static void
1.9 deraadt 462: add_file(char *s)
1.1 deraadt 463: {
464: struct s_flist *fp;
465:
466: fp = xmalloc(sizeof(struct s_flist));
467: fp->next = NULL;
468: *fl_nextp = fp;
469: fp->fname = s;
470: fl_nextp = &fp->next;
1.19 jasper 471: }
472:
473:
474: static int
475: next_files_have_lines()
476: {
1.20 deraadt 477: struct s_flist *file;
478: FILE *file_fd;
479: int ch;
480:
481: file = files;
482: while ((file = file->next) != NULL) {
483: if ((file_fd = fopen(file->fname, "r")) == NULL)
484: continue;
1.19 jasper 485:
1.20 deraadt 486: if ((ch = getc(file_fd)) != EOF) {
487: /*
488: * This next file has content, therefore current
489: * file doesn't contains the last line.
490: */
491: ungetc(ch, file_fd);
492: fclose(file_fd);
493: return (1);
494: }
495: fclose(file_fd);
496: }
497: return (0);
1.19 jasper 498: }
499:
500: int
501: lastline(void)
502: {
503: int ch;
504:
505: if (feof(infile)) {
506: return !(
507: (inplace == NULL) &&
508: next_files_have_lines());
509: }
510: if ((ch = getc(infile)) == EOF) {
511: return !(
512: (inplace == NULL) &&
513: next_files_have_lines());
514: }
515: ungetc(ch, infile);
516: return (0);
1.1 deraadt 517: }
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