1 /* $OpenBSD: main.c,v 1.68 2024/01/25 16:40:51 millert Exp $ */ 2 /**************************************************************** 3 Copyright (C) Lucent Technologies 1997 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 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. 24 ****************************************************************/ 25 26 const char *version = "version 20240122"; 27 28 #define DEBUG 29 #include <stdio.h> 30 #include <ctype.h> 31 #include <locale.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <signal.h> 35 #include <unistd.h> 36 #include "awk.h" 37 38 extern char *__progname; 39 extern char **environ; 40 extern int nfields; 41 42 int dbg = 0; 43 Awkfloat srand_seed = 1; 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 */ 48 enum compile_states compile_time = ERROR_PRINTING; 49 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 */ 54 55 bool CSV = false; /* true for csv input */ 56 bool safe = false; /* true => "safe" mode */ 57 bool do_posix = false; /* true => POSIX mode */ 58 59 size_t awk_mb_cur_max = 1; 60 61 static noreturn void fpecatch(int n 62 #ifdef SA_SIGINFO 63 , siginfo_t *si, void *uc 64 #endif 65 ) 66 { 67 extern Node *curnode; 68 #ifdef SA_SIGINFO 69 static const char *emsg[] = { 70 [0] = "Unknown error", 71 [FPE_INTDIV] = "Integer divide by zero", 72 [FPE_INTOVF] = "Integer overflow", 73 [FPE_FLTDIV] = "Floating point divide by zero", 74 [FPE_FLTOVF] = "Floating point overflow", 75 [FPE_FLTUND] = "Floating point underflow", 76 [FPE_FLTRES] = "Floating point inexact result", 77 [FPE_FLTINV] = "Invalid Floating point operation", 78 [FPE_FLTSUB] = "Subscript out of range", 79 }; 80 #endif 81 dprintf(STDERR_FILENO, "floating point exception%s%s\n", 82 #ifdef SA_SIGINFO 83 ": ", (size_t)si->si_code < sizeof(emsg) / sizeof(emsg[0]) && 84 emsg[si->si_code] ? emsg[si->si_code] : emsg[0] 85 #else 86 "", "" 87 #endif 88 ); 89 90 if (compile_time != 2 && NR && *NR > 0) { 91 dprintf(STDERR_FILENO, " input record number %d", (int) (*FNR)); 92 if (strcmp(*FILENAME, "-") != 0) { 93 dprintf(STDERR_FILENO, ", file %s", *FILENAME); 94 } 95 dprintf(STDERR_FILENO, "\n"); 96 } 97 if (compile_time != 2 && curnode) { 98 dprintf(STDERR_FILENO, " source line number %d", curnode->lineno); 99 } else if (compile_time != 2 && lineno) { 100 dprintf(STDERR_FILENO, " source line number %d", lineno); 101 } 102 if (compile_time == 1 && cursource() != NULL) { 103 dprintf(STDERR_FILENO, " source file %s", cursource()); 104 } 105 dprintf(STDERR_FILENO, "\n"); 106 if (dbg > 1) /* core dump if serious debugging on */ 107 abort(); 108 _exit(2); 109 } 110 111 static const char * 112 setfs(char *p) 113 { 114 /* wart: t=>\t */ 115 if (p[0] == 't' && p[1] == '\0') 116 return "\t"; 117 return p; 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 } 132 133 int main(int argc, char *argv[]) 134 { 135 const char *fs = NULL; 136 char *fn, *vn; 137 138 setlocale(LC_CTYPE, ""); 139 setlocale(LC_NUMERIC, "C"); /* for parsing cmdline & prog */ 140 awk_mb_cur_max = MB_CUR_MAX; 141 cmdname = __progname; 142 143 if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1) { 144 fprintf(stderr, "%s: pledge: incorrect arguments\n", 145 cmdname); 146 exit(1); 147 } 148 149 if (argc == 1) { 150 fprintf(stderr, "usage: %s [-safe] [-V] [-d[n]] " 151 "[-f fs | --csv] [-v var=value]\n" 152 "\t [prog | -f progfile] file ...\n", cmdname); 153 return 1; 154 } 155 #ifdef SA_SIGINFO 156 { 157 struct sigaction sa; 158 sa.sa_sigaction = fpecatch; 159 sa.sa_flags = SA_SIGINFO; 160 sigemptyset(&sa.sa_mask); 161 (void)sigaction(SIGFPE, &sa, NULL); 162 } 163 #else 164 (void)signal(SIGFPE, fpecatch); 165 #endif 166 167 do_posix = (getenv("POSIXLY_CORRECT") != NULL); 168 169 yyin = NULL; 170 symtab = makesymtab(NSYMTAB); 171 while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') { 172 if (strcmp(argv[1], "--version") == 0) { 173 printf("awk %s\n", version); 174 return 0; 175 } 176 if (strcmp(argv[1], "--") == 0) { /* explicit end of args */ 177 argc--; 178 argv++; 179 break; 180 } 181 if (strcmp(argv[1], "--csv") == 0) { /* turn on csv input processing */ 182 CSV = true; 183 argc--; 184 argv++; 185 continue; 186 } 187 switch (argv[1][1]) { 188 case 's': 189 if (strcmp(argv[1], "-safe") == 0) 190 safe = true; 191 break; 192 case 'f': /* next argument is program filename */ 193 fn = getarg(&argc, &argv, "no program filename"); 194 if (npfile >= maxpfile) { 195 maxpfile += 20; 196 pfile = (char **) reallocarray(pfile, maxpfile, sizeof(*pfile)); 197 if (pfile == NULL) 198 FATAL("error allocating space for -f options"); 199 } 200 pfile[npfile++] = fn; 201 break; 202 case 'F': /* set field separator */ 203 fs = setfs(getarg(&argc, &argv, "no field separator")); 204 break; 205 case 'v': /* -v a=1 to be done NOW. one -v for each */ 206 vn = getarg(&argc, &argv, "no variable name"); 207 if (isclvar(vn)) 208 setclvar(vn); 209 else 210 FATAL("invalid -v option argument: %s", vn); 211 break; 212 case 'd': 213 dbg = atoi(&argv[1][2]); 214 if (dbg == 0) 215 dbg = 1; 216 printf("awk %s\n", version); 217 break; 218 case 'V': 219 printf("awk %s\n", version); 220 return 0; 221 default: 222 WARNING("unknown option %s ignored", argv[1]); 223 break; 224 } 225 argc--; 226 argv++; 227 } 228 229 if (safe) { 230 if (pledge("stdio rpath", NULL) == -1) { 231 fprintf(stderr, "%s: pledge: incorrect arguments\n", 232 cmdname); 233 exit(1); 234 } 235 } 236 237 if (CSV && (fs != NULL || lookup("FS", symtab) != NULL)) 238 WARNING("danger: don't set FS when --csv is in effect"); 239 240 /* argv[1] is now the first argument */ 241 if (npfile == 0) { /* no -f; first argument is program */ 242 if (argc <= 1) { 243 if (dbg) 244 exit(0); 245 FATAL("no program given"); 246 } 247 DPRINTF("program = |%s|\n", argv[1]); 248 lexprog = argv[1]; 249 argc--; 250 argv++; 251 } 252 recinit(recsize); 253 syminit(); 254 compile_time = COMPILING; 255 argv[0] = cmdname; /* put prog name at front of arglist */ 256 DPRINTF("argc=%d, argv[0]=%s\n", argc, argv[0]); 257 arginit(argc, argv); 258 if (!safe) 259 envinit(environ); 260 yyparse(); 261 #if 0 262 // Doing this would comply with POSIX, but is not compatible with 263 // other awks and with what most users expect. So comment it out. 264 setlocale(LC_NUMERIC, ""); /* back to whatever it is locally */ 265 #endif 266 if (fs) 267 *FS = qstring(fs, '\0'); 268 DPRINTF("errorflag=%d\n", errorflag); 269 if (errorflag == 0) { 270 compile_time = RUNNING; 271 run(winner); 272 } else 273 bracecheck(); 274 return(errorflag); 275 } 276 277 int pgetc(void) /* get 1 character from awk program */ 278 { 279 int c; 280 281 for (;;) { 282 if (yyin == NULL) { 283 if (curpfile >= npfile) 284 return EOF; 285 if (strcmp(pfile[curpfile], "-") == 0) 286 yyin = stdin; 287 else if ((yyin = fopen(pfile[curpfile], "r")) == NULL) 288 FATAL("can't open file %s", pfile[curpfile]); 289 lineno = 1; 290 } 291 if ((c = getc(yyin)) != EOF) 292 return c; 293 if (yyin != stdin) 294 fclose(yyin); 295 yyin = NULL; 296 curpfile++; 297 } 298 } 299 300 char *cursource(void) /* current source file name */ 301 { 302 if (npfile > 0) 303 return pfile[curpfile < npfile ? curpfile : curpfile - 1]; 304 else 305 return NULL; 306 } 307