Annotation of src/usr.bin/awk/main.c, Revision 1.51
1.51 ! millert 1: /* $OpenBSD: main.c,v 1.50 2021/11/12 15:16:58 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:
1.51 ! millert 26: const char *version = "version 20211208";
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"
37:
38: extern char **environ;
39: extern int nfields;
1.6 millert 40: extern char *__progname;
1.1 tholo 41:
42: int dbg = 0;
1.17 millert 43: Awkfloat srand_seed = 1;
1.1 tholo 44: char *cmdname; /* gets argv[0] for error messages */
45: extern FILE *yyin; /* lex input file */
46: char *lexprog; /* points to program argument if it exists */
47: extern int errorflag; /* non-zero if any syntax errors; set by yyerror */
1.34 millert 48: enum compile_states compile_time = ERROR_PRINTING;
1.1 tholo 49:
1.37 millert 50: static char **pfile; /* program filenames from -f's */
51: static size_t maxpfile; /* max program filename */
52: static size_t npfile; /* number of filenames */
53: static size_t curpfile; /* current filename */
1.15 millert 54:
1.40 millert 55: bool safe = false; /* true => "safe" mode */
56: bool do_posix = false; /* true => POSIX mode */
1.37 millert 57:
1.38 millert 58: static noreturn void fpecatch(int n
1.37 millert 59: #ifdef SA_SIGINFO
60: , siginfo_t *si, void *uc
61: #endif
62: )
63: {
64: extern Node *curnode;
65: #ifdef SA_SIGINFO
66: static const char *emsg[] = {
67: [0] = "Unknown error",
68: [FPE_INTDIV] = "Integer divide by zero",
69: [FPE_INTOVF] = "Integer overflow",
70: [FPE_FLTDIV] = "Floating point divide by zero",
71: [FPE_FLTOVF] = "Floating point overflow",
72: [FPE_FLTUND] = "Floating point underflow",
73: [FPE_FLTRES] = "Floating point inexact result",
74: [FPE_FLTINV] = "Invalid Floating point operation",
75: [FPE_FLTSUB] = "Subscript out of range",
76: };
77: #endif
78: dprintf(STDERR_FILENO, "floating point exception%s%s\n",
79: #ifdef SA_SIGINFO
80: ": ", (size_t)si->si_code < sizeof(emsg) / sizeof(emsg[0]) &&
81: emsg[si->si_code] ? emsg[si->si_code] : emsg[0]
82: #else
83: "", ""
84: #endif
85: );
86:
87: if (compile_time != 2 && NR && *NR > 0) {
88: dprintf(STDERR_FILENO, " input record number %d", (int) (*FNR));
89: if (strcmp(*FILENAME, "-") != 0) {
90: dprintf(STDERR_FILENO, ", file %s", *FILENAME);
91: }
92: dprintf(STDERR_FILENO, "\n");
93: }
94: if (compile_time != 2 && curnode) {
95: dprintf(STDERR_FILENO, " source line number %d", curnode->lineno);
96: } else if (compile_time != 2 && lineno) {
97: dprintf(STDERR_FILENO, " source line number %d", lineno);
98: }
99: if (compile_time == 1 && cursource() != NULL) {
100: dprintf(STDERR_FILENO, " source file %s", cursource());
101: }
102: dprintf(STDERR_FILENO, "\n");
103: if (dbg > 1) /* core dump if serious debugging on */
104: abort();
105: _exit(2);
106: }
1.1 tholo 107:
1.37 millert 108: static const char *
109: setfs(char *p)
110: {
111: /* wart: t=>\t */
112: if (p[0] == 't' && p[1] == '\0')
113: return "\t";
1.48 millert 114: return p;
1.37 millert 115: }
116:
117: static char *
118: getarg(int *argc, char ***argv, const char *msg)
119: {
120: if ((*argv)[1][2] != '\0') { /* arg is -fsomething */
121: return &(*argv)[1][2];
122: } else { /* arg is -f something */
123: (*argc)--; (*argv)++;
124: if (*argc <= 1)
125: FATAL("%s", msg);
126: return (*argv)[1];
127: }
128: }
1.4 kstailey 129:
1.1 tholo 130: int main(int argc, char *argv[])
131: {
1.12 millert 132: const char *fs = NULL;
1.37 millert 133: char *fn, *vn;
1.2 tholo 134:
1.39 millert 135: setlocale(LC_CTYPE, "");
1.19 deraadt 136: setlocale(LC_NUMERIC, "C"); /* for parsing cmdline & prog */
137:
1.20 tb 138: cmdname = __progname;
1.18 doug 139: if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1) {
140: fprintf(stderr, "%s: pledge: incorrect arguments\n",
141: cmdname);
142: exit(1);
143: }
144:
1.1 tholo 145: if (argc == 1) {
1.14 jmc 146: fprintf(stderr, "usage: %s [-safe] [-V] [-d[n]] [-F fs] "
147: "[-v var=value] [prog | -f progfile]\n\tfile ...\n",
1.10 aaron 148: cmdname);
1.1 tholo 149: exit(1);
150: }
1.37 millert 151: #ifdef SA_SIGINFO
152: {
153: struct sigaction sa;
154: sa.sa_sigaction = fpecatch;
155: sa.sa_flags = SA_SIGINFO;
156: sigemptyset(&sa.sa_mask);
157: (void)sigaction(SIGFPE, &sa, NULL);
158: }
159: #else
160: (void)signal(SIGFPE, fpecatch);
161: #endif
1.40 millert 162:
163: do_posix = (getenv("POSIXLY_CORRECT") != NULL);
1.17 millert 164:
1.1 tholo 165: yyin = NULL;
166: symtab = makesymtab(NSYMTAB);
167: while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') {
1.4 kstailey 168: if (strcmp(argv[1], "--") == 0) { /* explicit end of args */
1.1 tholo 169: argc--;
170: argv++;
171: break;
172: }
173: switch (argv[1][1]) {
1.4 kstailey 174: case 's':
175: if (strcmp(argv[1], "-safe") == 0)
1.34 millert 176: safe = true;
1.4 kstailey 177: break;
1.1 tholo 178: case 'f': /* next argument is program filename */
1.37 millert 179: fn = getarg(&argc, &argv, "no program filename");
180: if (npfile >= maxpfile) {
181: maxpfile += 20;
1.46 millert 182: pfile = (char **) realloc(pfile, maxpfile * sizeof(*pfile));
1.37 millert 183: if (pfile == NULL)
184: FATAL("error allocating space for -f options");
185: }
186: pfile[npfile++] = fn;
187: break;
1.1 tholo 188: case 'F': /* set field separator */
1.37 millert 189: fs = setfs(getarg(&argc, &argv, "no field separator"));
1.1 tholo 190: break;
191: case 'v': /* -v a=1 to be done NOW. one -v for each */
1.37 millert 192: vn = getarg(&argc, &argv, "no variable name");
193: if (isclvar(vn))
194: setclvar(vn);
195: else
196: FATAL("invalid -v option argument: %s", vn);
1.1 tholo 197: break;
198: case 'd':
199: dbg = atoi(&argv[1][2]);
200: if (dbg == 0)
201: dbg = 1;
202: printf("awk %s\n", version);
1.6 millert 203: break;
204: case 'V': /* added for exptools "standard" */
205: printf("awk %s\n", version);
206: exit(0);
1.1 tholo 207: break;
208: default:
1.9 millert 209: WARNING("unknown option %s ignored", argv[1]);
1.1 tholo 210: break;
211: }
212: argc--;
213: argv++;
214: }
1.18 doug 215:
216: if (safe) {
217: if (pledge("stdio rpath", NULL) == -1) {
218: fprintf(stderr, "%s: pledge: incorrect arguments\n",
219: cmdname);
220: exit(1);
221: }
222: }
223:
1.1 tholo 224: /* argv[1] is now the first argument */
225: if (npfile == 0) { /* no -f; first argument is program */
226: if (argc <= 1) {
227: if (dbg)
228: exit(0);
1.9 millert 229: FATAL("no program given");
1.1 tholo 230: }
1.42 millert 231: DPRINTF("program = |%s|\n", argv[1]);
1.1 tholo 232: lexprog = argv[1];
233: argc--;
234: argv++;
235: }
236: recinit(recsize);
237: syminit();
1.34 millert 238: compile_time = COMPILING;
1.1 tholo 239: argv[0] = cmdname; /* put prog name at front of arglist */
1.42 millert 240: DPRINTF("argc=%d, argv[0]=%s\n", argc, argv[0]);
1.1 tholo 241: arginit(argc, argv);
1.4 kstailey 242: if (!safe)
243: envinit(environ);
1.1 tholo 244: yyparse();
1.37 millert 245: #if 0
246: // Doing this would comply with POSIX, but is not compatible with
247: // other awks and with what most users expect. So comment it out.
1.13 millert 248: setlocale(LC_NUMERIC, ""); /* back to whatever it is locally */
1.37 millert 249: #endif
1.1 tholo 250: if (fs)
1.4 kstailey 251: *FS = qstring(fs, '\0');
1.42 millert 252: DPRINTF("errorflag=%d\n", errorflag);
1.1 tholo 253: if (errorflag == 0) {
1.34 millert 254: compile_time = RUNNING;
1.1 tholo 255: run(winner);
256: } else
257: bracecheck();
258: return(errorflag);
259: }
260:
261: int pgetc(void) /* get 1 character from awk program */
262: {
263: int c;
264:
265: for (;;) {
266: if (yyin == NULL) {
267: if (curpfile >= npfile)
268: return EOF;
1.4 kstailey 269: if (strcmp(pfile[curpfile], "-") == 0)
1.1 tholo 270: yyin = stdin;
1.4 kstailey 271: else if ((yyin = fopen(pfile[curpfile], "r")) == NULL)
1.9 millert 272: FATAL("can't open file %s", pfile[curpfile]);
1.7 millert 273: lineno = 1;
1.1 tholo 274: }
275: if ((c = getc(yyin)) != EOF)
276: return c;
277: if (yyin != stdin)
278: fclose(yyin);
279: yyin = NULL;
280: curpfile++;
281: }
1.7 millert 282: }
283:
284: char *cursource(void) /* current source file name */
285: {
286: if (npfile > 0)
1.44 millert 287: return pfile[curpfile < npfile ? curpfile : curpfile - 1];
1.7 millert 288: else
289: return NULL;
1.1 tholo 290: }
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