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IABSD.fr/src/usr.bin/awk/main.c
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/* $OpenBSD: main.c,v 1.74 2026/03/22 05:07:06 deraadt Exp $ */ /**************************************************************** Copyright (C) Lucent Technologies 1997 All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that the copyright notice and this permission notice and warranty disclaimer appear in supporting documentation, and that the name Lucent Technologies or any of its entities not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ****************************************************************/ const char *version = "version 20250116"; #define DEBUG #include <stdio.h> #include <ctype.h> #include <locale.h> #include <stdlib.h> #include <string.h> #include <signal.h> #include <unistd.h> #include "awk.h" extern char *__progname; extern char **environ; extern int nfields; int dbg = 0; Awkfloat srand_seed = 1; char *cmdname; /* gets argv[0] for error messages */ extern FILE *yyin; /* lex input file */ char *lexprog; /* points to program argument if it exists */ extern int errorflag; /* non-zero if any syntax errors; set by yyerror */ enum compile_states compile_time = ERROR_PRINTING; static char **pfile; /* program filenames from -f's */ static size_t maxpfile; /* max program filename */ static size_t npfile; /* number of filenames */ static size_t curpfile; /* current filename */ bool CSV = false; /* true for csv input */ bool safe = false; /* true => "safe" mode */ bool do_posix = false; /* true => POSIX mode */ size_t awk_mb_cur_max = 1; static noreturn void fpecatch(int n #ifdef SA_SIGINFO , siginfo_t *si, void *uc #endif ) { extern Node *curnode; #ifdef SA_SIGINFO const char *mesg = NULL; switch (si->si_code) { case FPE_INTDIV: mesg = "Integer divide by zero"; break; case FPE_INTOVF: mesg = "Integer overflow"; break; case FPE_FLTDIV: mesg = "Floating point divide by zero"; break; case FPE_FLTOVF: mesg = "Floating point overflow"; break; case FPE_FLTUND: mesg = "Floating point underflow"; break; case FPE_FLTRES: mesg = "Floating point inexact result"; break; case FPE_FLTINV: mesg = "Invalid Floating point operation"; break; case FPE_FLTSUB: mesg = "Subscript out of range"; break; case 0: default: mesg = "Unknown error"; break; } #endif dprintf(STDERR_FILENO, "floating point exception%s%s\n", #ifdef SA_SIGINFO ": ", mesg #else "", "" #endif ); if (compile_time != 2 && NR && *NR > 0) { dprintf(STDERR_FILENO, " input record number %d", (int) (*FNR)); if (strcmp(*FILENAME, "-") != 0) { dprintf(STDERR_FILENO, ", file %s", *FILENAME); } dprintf(STDERR_FILENO, "\n"); } if (compile_time != 2 && curnode) { dprintf(STDERR_FILENO, " source line number %d", curnode->lineno); } else if (compile_time != 2 && lineno) { dprintf(STDERR_FILENO, " source line number %d", lineno); } if (compile_time == 1 && cursource() != NULL) { dprintf(STDERR_FILENO, " source file %s", cursource()); } dprintf(STDERR_FILENO, "\n"); if (dbg > 1) /* core dump if serious debugging on */ abort(); _exit(2); } static const char * setfs(char *p) { /* wart: t=>\t */ if (p[0] == 't' && p[1] == '\0') return "\t"; return p; } static char * getarg(int *argc, char ***argv, const char *msg) { if ((*argv)[1][2] != '\0') { /* arg is -fsomething */ return &(*argv)[1][2]; } else { /* arg is -f something */ (*argc)--; (*argv)++; if (*argc <= 1) FATAL("%s", msg); return (*argv)[1]; } } int main(int argc, char *argv[]) { const char *fs = NULL; char *fn, *vn; setlocale(LC_CTYPE, ""); setlocale(LC_NUMERIC, "C"); /* for parsing cmdline & prog */ awk_mb_cur_max = MB_CUR_MAX; cmdname = __progname; if (argc == 1) { fprintf(stderr, "usage: %s [-safe] [-V] [-d[n]] " "[-f fs | --csv] [-v var=value]\n" "\t [prog | -f progfile] file ...\n", cmdname); return 1; } #ifdef SA_SIGINFO { struct sigaction sa; sa.sa_sigaction = fpecatch; sa.sa_flags = SA_SIGINFO; sigemptyset(&sa.sa_mask); (void)sigaction(SIGFPE, &sa, NULL); } #else (void)signal(SIGFPE, fpecatch); #endif do_posix = (getenv("POSIXLY_CORRECT") != NULL); yyin = NULL; symtab = makesymtab(NSYMTAB); while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') { if (strcmp(argv[1], "--version") == 0) { printf("awk %s\n", version); return 0; } if (strcmp(argv[1], "--") == 0) { /* explicit end of args */ argc--; argv++; break; } if (strcmp(argv[1], "--csv") == 0) { /* turn on csv input processing */ CSV = true; argc--; argv++; continue; } switch (argv[1][1]) { case 's': if (strcmp(argv[1], "-safe") == 0) safe = true; break; case 'f': /* next argument is program filename */ fn = getarg(&argc, &argv, "no program filename"); if (npfile >= maxpfile) { maxpfile += 20; pfile = (char **) reallocarray(pfile, maxpfile, sizeof(*pfile)); if (pfile == NULL) FATAL("error allocating space for -f options"); } pfile[npfile++] = fn; break; case 'F': /* set field separator */ fs = setfs(getarg(&argc, &argv, "no field separator")); break; case 'v': /* -v a=1 to be done NOW. one -v for each */ vn = getarg(&argc, &argv, "no variable name"); if (isclvar(vn)) setclvar(vn); else FATAL("invalid -v option argument: %s", vn); break; case 'd': dbg = atoi(&argv[1][2]); if (dbg == 0) dbg = 1; printf("awk %s\n", version); break; case 'V': printf("awk %s\n", version); return 0; default: WARNING("unknown option %s ignored", argv[1]); break; } argc--; argv++; } if (safe) { if (unveil("/", "r") == -1) { fprintf(stderr, "%s: unveil: / r\n", cmdname); exit(1); } if (unveil("/dev/null", "rw") == -1) { fprintf(stderr, "%s: unveil: /dev/null rw\n", cmdname); exit(1); } if (pledge("stdio rpath wpath", NULL) == -1) { fprintf(stderr, "%s: pledge: incorrect arguments\n", cmdname); exit(1); } } else { if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1) { fprintf(stderr, "%s: pledge: incorrect arguments\n", cmdname); exit(1); } } if (CSV && (fs != NULL || lookup("FS", symtab) != NULL)) WARNING("danger: don't set FS when --csv is in effect"); /* argv[1] is now the first argument */ if (npfile == 0) { /* no -f; first argument is program */ if (argc <= 1) { if (dbg) exit(0); FATAL("no program given"); } DPRINTF("program = |%s|\n", argv[1]); lexprog = argv[1]; argc--; argv++; } recinit(recsize); syminit(); compile_time = COMPILING; argv[0] = cmdname; /* put prog name at front of arglist */ DPRINTF("argc=%d, argv[0]=%s\n", argc, argv[0]); arginit(argc, argv); if (!safe) envinit(environ); yyparse(); #if 0 // Doing this would comply with POSIX, but is not compatible with // other awks and with what most users expect. So comment it out. setlocale(LC_NUMERIC, ""); /* back to whatever it is locally */ #endif if (fs) *FS = qstring(fs, '\0'); DPRINTF("errorflag=%d\n", errorflag); if (errorflag == 0) { compile_time = RUNNING; run(winner); } else bracecheck(); return(errorflag); } int pgetc(void) /* get 1 character from awk program */ { int c; for (;;) { if (yyin == NULL) { if (curpfile >= npfile) return EOF; if (strcmp(pfile[curpfile], "-") == 0) yyin = stdin; else if ((yyin = fopen(pfile[curpfile], "r")) == NULL) FATAL("can't open file %s", pfile[curpfile]); lineno = 1; } if ((c = getc(yyin)) != EOF) return c; if (yyin != stdin) fclose(yyin); yyin = NULL; curpfile++; } } char *cursource(void) /* current source file name */ { if (npfile > 0) return pfile[curpfile < npfile ? curpfile : curpfile - 1]; else return NULL; }