Annotation of src/usr.bin/awk/main.c, Revision 1.42
1.42 ! millert 1: /* $OpenBSD: main.c,v 1.41 2020/06/26 15:50:06 millert Exp $ */
1.1 tholo 2: /****************************************************************
1.4 kstailey 3: Copyright (C) Lucent Technologies 1997
1.1 tholo 4: All Rights Reserved
5:
6: Permission to use, copy, modify, and distribute this software and
7: its documentation for any purpose and without fee is hereby
8: granted, provided that the above copyright notice appear in all
9: copies and that both that the copyright notice and this
10: permission notice and warranty disclaimer appear in supporting
1.4 kstailey 11: documentation, and that the name Lucent Technologies or any of
12: its entities not be used in advertising or publicity pertaining
13: to distribution of the software without specific, written prior
14: permission.
15:
16: LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
17: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
18: IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
19: SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
20: WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
21: IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
22: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
23: THIS SOFTWARE.
1.1 tholo 24: ****************************************************************/
25:
1.42 ! millert 26: const char *version = "version 20200625";
1.1 tholo 27:
28: #define DEBUG
29: #include <stdio.h>
30: #include <ctype.h>
1.3 millert 31: #include <locale.h>
1.1 tholo 32: #include <stdlib.h>
33: #include <string.h>
34: #include <signal.h>
1.18 doug 35: #include <unistd.h>
1.1 tholo 36: #include "awk.h"
1.4 kstailey 37: #include "ytab.h"
1.1 tholo 38:
39: extern char **environ;
40: extern int nfields;
1.6 millert 41: extern char *__progname;
1.1 tholo 42:
43: int dbg = 0;
1.17 millert 44: Awkfloat srand_seed = 1;
1.1 tholo 45: char *cmdname; /* gets argv[0] for error messages */
46: extern FILE *yyin; /* lex input file */
47: char *lexprog; /* points to program argument if it exists */
48: extern int errorflag; /* non-zero if any syntax errors; set by yyerror */
1.34 millert 49: enum compile_states compile_time = ERROR_PRINTING;
1.1 tholo 50:
1.37 millert 51: static char **pfile; /* program filenames from -f's */
52: static size_t maxpfile; /* max program filename */
53: static size_t npfile; /* number of filenames */
54: static size_t curpfile; /* current filename */
1.15 millert 55:
1.40 millert 56: bool safe = false; /* true => "safe" mode */
57: bool do_posix = false; /* true => POSIX mode */
1.37 millert 58:
1.38 millert 59: static noreturn void fpecatch(int n
1.37 millert 60: #ifdef SA_SIGINFO
61: , siginfo_t *si, void *uc
62: #endif
63: )
64: {
65: extern Node *curnode;
66: #ifdef SA_SIGINFO
67: static const char *emsg[] = {
68: [0] = "Unknown error",
69: [FPE_INTDIV] = "Integer divide by zero",
70: [FPE_INTOVF] = "Integer overflow",
71: [FPE_FLTDIV] = "Floating point divide by zero",
72: [FPE_FLTOVF] = "Floating point overflow",
73: [FPE_FLTUND] = "Floating point underflow",
74: [FPE_FLTRES] = "Floating point inexact result",
75: [FPE_FLTINV] = "Invalid Floating point operation",
76: [FPE_FLTSUB] = "Subscript out of range",
77: };
78: #endif
79: dprintf(STDERR_FILENO, "floating point exception%s%s\n",
80: #ifdef SA_SIGINFO
81: ": ", (size_t)si->si_code < sizeof(emsg) / sizeof(emsg[0]) &&
82: emsg[si->si_code] ? emsg[si->si_code] : emsg[0]
83: #else
84: "", ""
85: #endif
86: );
87:
88: if (compile_time != 2 && NR && *NR > 0) {
89: dprintf(STDERR_FILENO, " input record number %d", (int) (*FNR));
90: if (strcmp(*FILENAME, "-") != 0) {
91: dprintf(STDERR_FILENO, ", file %s", *FILENAME);
92: }
93: dprintf(STDERR_FILENO, "\n");
94: }
95: if (compile_time != 2 && curnode) {
96: dprintf(STDERR_FILENO, " source line number %d", curnode->lineno);
97: } else if (compile_time != 2 && lineno) {
98: dprintf(STDERR_FILENO, " source line number %d", lineno);
99: }
100: if (compile_time == 1 && cursource() != NULL) {
101: dprintf(STDERR_FILENO, " source file %s", cursource());
102: }
103: dprintf(STDERR_FILENO, "\n");
104: if (dbg > 1) /* core dump if serious debugging on */
105: abort();
106: _exit(2);
107: }
1.1 tholo 108:
1.37 millert 109: static const char *
110: setfs(char *p)
111: {
112: /* wart: t=>\t */
113: if (p[0] == 't' && p[1] == '\0')
114: return "\t";
115: else if (p[0] != '\0')
116: return p;
117: return NULL;
118: }
119:
120: static char *
121: getarg(int *argc, char ***argv, const char *msg)
122: {
123: if ((*argv)[1][2] != '\0') { /* arg is -fsomething */
124: return &(*argv)[1][2];
125: } else { /* arg is -f something */
126: (*argc)--; (*argv)++;
127: if (*argc <= 1)
128: FATAL("%s", msg);
129: return (*argv)[1];
130: }
131: }
1.4 kstailey 132:
1.1 tholo 133: int main(int argc, char *argv[])
134: {
1.12 millert 135: const char *fs = NULL;
1.37 millert 136: char *fn, *vn;
1.2 tholo 137:
1.39 millert 138: setlocale(LC_CTYPE, "");
1.19 deraadt 139: setlocale(LC_NUMERIC, "C"); /* for parsing cmdline & prog */
140:
1.20 tb 141: cmdname = __progname;
1.18 doug 142: if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1) {
143: fprintf(stderr, "%s: pledge: incorrect arguments\n",
144: cmdname);
145: exit(1);
146: }
147:
1.1 tholo 148: if (argc == 1) {
1.14 jmc 149: fprintf(stderr, "usage: %s [-safe] [-V] [-d[n]] [-F fs] "
150: "[-v var=value] [prog | -f progfile]\n\tfile ...\n",
1.10 aaron 151: cmdname);
1.1 tholo 152: exit(1);
153: }
1.37 millert 154: #ifdef SA_SIGINFO
155: {
156: struct sigaction sa;
157: sa.sa_sigaction = fpecatch;
158: sa.sa_flags = SA_SIGINFO;
159: sigemptyset(&sa.sa_mask);
160: (void)sigaction(SIGFPE, &sa, NULL);
161: }
162: #else
163: (void)signal(SIGFPE, fpecatch);
164: #endif
1.40 millert 165:
166: do_posix = (getenv("POSIXLY_CORRECT") != NULL);
1.17 millert 167:
1.1 tholo 168: yyin = NULL;
169: symtab = makesymtab(NSYMTAB);
170: while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') {
1.4 kstailey 171: if (strcmp(argv[1], "--") == 0) { /* explicit end of args */
1.1 tholo 172: argc--;
173: argv++;
174: break;
175: }
176: switch (argv[1][1]) {
1.4 kstailey 177: case 's':
178: if (strcmp(argv[1], "-safe") == 0)
1.34 millert 179: safe = true;
1.4 kstailey 180: break;
1.1 tholo 181: case 'f': /* next argument is program filename */
1.37 millert 182: fn = getarg(&argc, &argv, "no program filename");
183: if (npfile >= maxpfile) {
184: maxpfile += 20;
185: pfile = realloc(pfile, maxpfile * sizeof(*pfile));
186: if (pfile == NULL)
187: FATAL("error allocating space for -f options");
188: }
189: pfile[npfile++] = fn;
190: break;
1.1 tholo 191: case 'F': /* set field separator */
1.37 millert 192: fs = setfs(getarg(&argc, &argv, "no field separator"));
193: if (fs == NULL)
1.9 millert 194: WARNING("field separator FS is empty");
1.1 tholo 195: break;
196: case 'v': /* -v a=1 to be done NOW. one -v for each */
1.37 millert 197: vn = getarg(&argc, &argv, "no variable name");
198: if (isclvar(vn))
199: setclvar(vn);
200: else
201: FATAL("invalid -v option argument: %s", vn);
1.1 tholo 202: break;
203: case 'd':
204: dbg = atoi(&argv[1][2]);
205: if (dbg == 0)
206: dbg = 1;
207: printf("awk %s\n", version);
1.6 millert 208: break;
209: case 'V': /* added for exptools "standard" */
210: printf("awk %s\n", version);
211: exit(0);
1.1 tholo 212: break;
213: default:
1.9 millert 214: WARNING("unknown option %s ignored", argv[1]);
1.1 tholo 215: break;
216: }
217: argc--;
218: argv++;
219: }
1.18 doug 220:
221: if (safe) {
222: if (pledge("stdio rpath", NULL) == -1) {
223: fprintf(stderr, "%s: pledge: incorrect arguments\n",
224: cmdname);
225: exit(1);
226: }
227: }
228:
1.1 tholo 229: /* argv[1] is now the first argument */
230: if (npfile == 0) { /* no -f; first argument is program */
231: if (argc <= 1) {
232: if (dbg)
233: exit(0);
1.9 millert 234: FATAL("no program given");
1.1 tholo 235: }
1.42 ! millert 236: DPRINTF("program = |%s|\n", argv[1]);
1.1 tholo 237: lexprog = argv[1];
238: argc--;
239: argv++;
240: }
241: recinit(recsize);
242: syminit();
1.34 millert 243: compile_time = COMPILING;
1.1 tholo 244: argv[0] = cmdname; /* put prog name at front of arglist */
1.42 ! millert 245: DPRINTF("argc=%d, argv[0]=%s\n", argc, argv[0]);
1.1 tholo 246: arginit(argc, argv);
1.4 kstailey 247: if (!safe)
248: envinit(environ);
1.1 tholo 249: yyparse();
1.37 millert 250: #if 0
251: // Doing this would comply with POSIX, but is not compatible with
252: // other awks and with what most users expect. So comment it out.
1.13 millert 253: setlocale(LC_NUMERIC, ""); /* back to whatever it is locally */
1.37 millert 254: #endif
1.1 tholo 255: if (fs)
1.4 kstailey 256: *FS = qstring(fs, '\0');
1.42 ! millert 257: DPRINTF("errorflag=%d\n", errorflag);
1.1 tholo 258: if (errorflag == 0) {
1.34 millert 259: compile_time = RUNNING;
1.1 tholo 260: run(winner);
261: } else
262: bracecheck();
263: return(errorflag);
264: }
265:
266: int pgetc(void) /* get 1 character from awk program */
267: {
268: int c;
269:
270: for (;;) {
271: if (yyin == NULL) {
272: if (curpfile >= npfile)
273: return EOF;
1.4 kstailey 274: if (strcmp(pfile[curpfile], "-") == 0)
1.1 tholo 275: yyin = stdin;
1.4 kstailey 276: else if ((yyin = fopen(pfile[curpfile], "r")) == NULL)
1.9 millert 277: FATAL("can't open file %s", pfile[curpfile]);
1.7 millert 278: lineno = 1;
1.1 tholo 279: }
280: if ((c = getc(yyin)) != EOF)
281: return c;
282: if (yyin != stdin)
283: fclose(yyin);
284: yyin = NULL;
285: curpfile++;
286: }
1.7 millert 287: }
288:
289: char *cursource(void) /* current source file name */
290: {
291: if (npfile > 0)
292: return pfile[curpfile];
293: else
294: return NULL;
1.1 tholo 295: }
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