ref: ea413b4a62be9993e4b63bf237f0b1d482f4aafa
dir: /sys/src/cmd/awk/main.c/
/**************************************************************** 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. ****************************************************************/ char *version = "version 19990602"; #include <u.h> #include <libc.h> #include <bio.h> #include "awk.h" #include "y.tab.h" extern int nfields; Biobuf stdin; Biobuf stdout; Biobuf stderr; int dbg = 0; char *cmdname; /* gets argv[0] for error messages */ extern Biobuf *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 */ int compile_time = 2; /* for error printing: */ /* 2 = cmdline, 1 = compile, 0 = running */ char *pfile[20]; /* program filenames from -f's */ int npfile = 0; /* number of filenames */ int curpfile = 0; /* current filename */ int safe = 0; /* 1 => "safe" mode */ void main(int argc, char *argv[]) { char *fs = nil, *marg; int temp; setfcr(getfcr() & ~FPINVAL); Binit(&stdin, 0, OREAD); Binit(&stdout, 1, OWRITE); Binit(&stderr, 2, OWRITE); cmdname = argv[0]; if (argc == 1) { Bprint(&stderr, "Usage: %s [-F fieldsep] [-mf n] [-mr n] [-v var=value] [-f programfile | 'program'] [file ...]\n", cmdname); exits("usage"); } atnotify(handler, 1); yyin = nil; symtab = makesymtab(NSYMTAB); while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') { if (strcmp(argv[1], "--") == 0) { /* explicit end of args */ argc--; argv++; break; } switch (argv[1][1]) { case 's': if (strcmp(argv[1], "-safe") == 0) safe = 1; break; case 'f': /* next argument is program filename */ argc--; argv++; if (argc <= 1) FATAL("no program filename"); pfile[npfile++] = argv[1]; break; case 'F': /* set field separator */ if (argv[1][2] != 0) { /* arg is -Fsomething */ if (argv[1][2] == 't' && argv[1][3] == 0) /* wart: t=>\t */ fs = "\t"; else if (argv[1][2] != 0) fs = &argv[1][2]; } else { /* arg is -F something */ argc--; argv++; if (argc > 1 && argv[1][0] == 't' && argv[1][1] == 0) /* wart: t=>\t */ fs = "\t"; else if (argc > 1 && argv[1][0] != 0) fs = &argv[1][0]; } if (fs == nil || *fs == '\0') WARNING("field separator FS is empty"); break; case 'v': /* -v a=1 to be done NOW. one -v for each */ if (argv[1][2] == '\0' && --argc > 1 && isclvar((++argv)[1])) setclvar(argv[1]); break; case 'm': /* more memory: -mr=record, -mf=fields */ /* no longer needed */ marg = argv[1]; if (argv[1][3]) temp = atoi(&argv[1][3]); else { argv++; argc--; temp = atoi(&argv[1][0]); } switch (marg[2]) { case 'r': recsize = temp; break; case 'f': nfields = temp; break; default: FATAL("unknown option %s\n", marg); } break; case 'd': dbg = atoi(&argv[1][2]); if (dbg == 0) dbg = 1; print("awk %s\n", version); break; case 'V': /* added for exptools "standard" */ print("awk %s\n", version); exits(0); break; default: WARNING("unknown option %s ignored", argv[1]); break; } argc--; argv++; } /* argv[1] is now the first argument */ if (npfile == 0) { /* no -f; first argument is program */ if (argc <= 1) { if (dbg) exits(0); FATAL("no program given"); } dprint( ("program = |%s|\n", argv[1]) ); lexprog = argv[1]; argc--; argv++; } recinit(recsize); syminit(); compile_time = 1; argv[0] = cmdname; /* put prog name at front of arglist */ dprint( ("argc=%d, argv[0]=%s\n", argc, argv[0]) ); arginit(argc, argv); yyparse(); if (fs) *FS = qstring(fs, '\0'); dprint( ("errorflag=%d\n", errorflag) ); if (errorflag == 0) { compile_time = 0; run(winner); } else bracecheck(); if(errorflag) exits("error"); exits(0); } int pgetc(void) /* get 1 character from awk program */ { int c; for (;;) { if (yyin == nil) { if (curpfile >= npfile) return Beof; if (strcmp(pfile[curpfile], "-") == 0) yyin = &stdin; else if ((yyin = Bopen(pfile[curpfile], OREAD)) == nil) FATAL("can't open file %s", pfile[curpfile]); lineno = 1; } if ((c = Bgetc(yyin)) != Beof) return c; if (yyin != &stdin) Bterm(yyin); yyin = nil; curpfile++; } } char *cursource(void) /* current source file name */ { if (npfile > 0) return pfile[curpfile]; else return nil; }