99f6a43296
printstat and awkprintf are very clear: print statement errors are fatal. In Jan 2020 [1], to prevent fatal print errors from masquerading as fclose warnings, every WARNING in closefile and closeall became FATAL. This broke awk's close and getline functions. close no longer returns if there's an error, unless the stream doesn't exist. getline read errors still return -1, but they are no longer ignorable. Eventually, one of the closing functions will inspect the stream with ferror and call FATAL. In Jul 2020 [2], fatal stdout write errors which had been detectable by closefile for a few months became invisible, a consequence of switching standard streams from fclose (which reports flush errors) to freopen (which ignores them). The Jan 2020 changes which broke getline and close were themselves partially broken. The solution is to finish printing before closing. That is to flush and ferror every stream opened for writing before calling fclose, pclose, or freopen. A failure to write print statement data is fatal. A failure to close a flushed stream is a warning. They must be handled separately. Every redirected print statement is finished in printstat or awkprintf. The same is not true of unredirected print statements. To finish these, stdout must be flushed at some point after the final such statement. Any problem with that flush is fatal. Though only stdout needs it, let's defensively finish every stream opened for writing, so this bug won't recur if someone changes how redirected streams are flushed. Write errors on stderr by the implementation are never fatal. When closing, we only warn of them. Write errors from an application attempting a redirected print to /dev/stderr are as immediately fatal as every other redirected print statement. [1]fed1a562c3
[2]b82b649aa6
258 lines
6.6 KiB
C
258 lines
6.6 KiB
C
/****************************************************************
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Copyright (C) Lucent Technologies 1997
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name Lucent Technologies or any of
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its entities not be used in advertising or publicity pertaining
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to distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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const char *version = "version 20211208";
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#define DEBUG
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#include <stdio.h>
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#include <ctype.h>
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#include <locale.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include "awk.h"
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extern char **environ;
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extern int nfields;
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int dbg = 0;
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Awkfloat srand_seed = 1;
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char *cmdname; /* gets argv[0] for error messages */
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extern FILE *yyin; /* lex input file */
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char *lexprog; /* points to program argument if it exists */
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extern int errorflag; /* non-zero if any syntax errors; set by yyerror */
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enum compile_states compile_time = ERROR_PRINTING;
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static char **pfile; /* program filenames from -f's */
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static size_t maxpfile; /* max program filename */
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static size_t npfile; /* number of filenames */
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static size_t curpfile; /* current filename */
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bool safe = false; /* true => "safe" mode */
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static noreturn void fpecatch(int n
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#ifdef SA_SIGINFO
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, siginfo_t *si, void *uc
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#endif
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)
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{
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#ifdef SA_SIGINFO
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static const char *emsg[] = {
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[0] = "Unknown error",
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[FPE_INTDIV] = "Integer divide by zero",
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[FPE_INTOVF] = "Integer overflow",
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[FPE_FLTDIV] = "Floating point divide by zero",
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[FPE_FLTOVF] = "Floating point overflow",
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[FPE_FLTUND] = "Floating point underflow",
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[FPE_FLTRES] = "Floating point inexact result",
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[FPE_FLTINV] = "Invalid Floating point operation",
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[FPE_FLTSUB] = "Subscript out of range",
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};
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#endif
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FATAL("floating point exception"
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#ifdef SA_SIGINFO
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": %s", (size_t)si->si_code < sizeof(emsg) / sizeof(emsg[0]) &&
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emsg[si->si_code] ? emsg[si->si_code] : emsg[0]
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#endif
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);
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}
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/* Can this work with recursive calls? I don't think so.
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void segvcatch(int n)
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{
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FATAL("segfault. Do you have an unbounded recursive call?", n);
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}
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*/
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static const char *
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setfs(char *p)
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{
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/* wart: t=>\t */
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if (p[0] == 't' && p[1] == '\0')
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return "\t";
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return p;
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}
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static char *
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getarg(int *argc, char ***argv, const char *msg)
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{
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if ((*argv)[1][2] != '\0') { /* arg is -fsomething */
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return &(*argv)[1][2];
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} else { /* arg is -f something */
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(*argc)--; (*argv)++;
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if (*argc <= 1)
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FATAL("%s", msg);
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return (*argv)[1];
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}
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}
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int main(int argc, char *argv[])
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{
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const char *fs = NULL;
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char *fn, *vn;
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setlocale(LC_CTYPE, "");
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setlocale(LC_NUMERIC, "C"); /* for parsing cmdline & prog */
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cmdname = argv[0];
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if (argc == 1) {
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fprintf(stderr,
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"usage: %s [-F fs] [-v var=value] [-f progfile | 'prog'] [file ...]\n",
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cmdname);
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exit(1);
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}
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#ifdef SA_SIGINFO
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{
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struct sigaction sa;
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sa.sa_sigaction = fpecatch;
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sa.sa_flags = SA_SIGINFO;
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sigemptyset(&sa.sa_mask);
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(void)sigaction(SIGFPE, &sa, NULL);
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}
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#else
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(void)signal(SIGFPE, fpecatch);
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#endif
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/*signal(SIGSEGV, segvcatch); experiment */
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/* Set and keep track of the random seed */
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srand_seed = 1;
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srandom((unsigned long) srand_seed);
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yyin = NULL;
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symtab = makesymtab(NSYMTAB/NSYMTAB);
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while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') {
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if (strcmp(argv[1], "-version") == 0 || strcmp(argv[1], "--version") == 0) {
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printf("awk %s\n", version);
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return 0;
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}
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if (strcmp(argv[1], "--") == 0) { /* explicit end of args */
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argc--;
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argv++;
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break;
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}
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switch (argv[1][1]) {
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case 's':
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if (strcmp(argv[1], "-safe") == 0)
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safe = true;
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break;
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case 'f': /* next argument is program filename */
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fn = getarg(&argc, &argv, "no program filename");
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if (npfile >= maxpfile) {
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maxpfile += 20;
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pfile = (char **) realloc(pfile, maxpfile * sizeof(*pfile));
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if (pfile == NULL)
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FATAL("error allocating space for -f options");
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}
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pfile[npfile++] = fn;
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break;
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case 'F': /* set field separator */
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fs = setfs(getarg(&argc, &argv, "no field separator"));
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break;
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case 'v': /* -v a=1 to be done NOW. one -v for each */
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vn = getarg(&argc, &argv, "no variable name");
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if (isclvar(vn))
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setclvar(vn);
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else
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FATAL("invalid -v option argument: %s", vn);
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break;
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case 'd':
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dbg = atoi(&argv[1][2]);
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if (dbg == 0)
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dbg = 1;
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printf("awk %s\n", version);
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break;
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default:
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WARNING("unknown option %s ignored", argv[1]);
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break;
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}
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argc--;
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argv++;
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}
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/* argv[1] is now the first argument */
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if (npfile == 0) { /* no -f; first argument is program */
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if (argc <= 1) {
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if (dbg)
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exit(0);
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FATAL("no program given");
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}
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DPRINTF("program = |%s|\n", argv[1]);
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lexprog = argv[1];
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argc--;
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argv++;
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}
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recinit(recsize);
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syminit();
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compile_time = COMPILING;
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argv[0] = cmdname; /* put prog name at front of arglist */
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DPRINTF("argc=%d, argv[0]=%s\n", argc, argv[0]);
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arginit(argc, argv);
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if (!safe)
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envinit(environ);
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yyparse();
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#if 0
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// Doing this would comply with POSIX, but is not compatible with
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// other awks and with what most users expect. So comment it out.
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setlocale(LC_NUMERIC, ""); /* back to whatever it is locally */
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#endif
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if (fs)
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*FS = qstring(fs, '\0');
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DPRINTF("errorflag=%d\n", errorflag);
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if (errorflag == 0) {
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compile_time = RUNNING;
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run(winner);
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} else
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bracecheck();
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return(errorflag);
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}
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int pgetc(void) /* get 1 character from awk program */
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{
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int c;
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for (;;) {
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if (yyin == NULL) {
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if (curpfile >= npfile)
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return EOF;
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if (strcmp(pfile[curpfile], "-") == 0)
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yyin = stdin;
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else if ((yyin = fopen(pfile[curpfile], "r")) == NULL)
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FATAL("can't open file %s", pfile[curpfile]);
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lineno = 1;
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}
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if ((c = getc(yyin)) != EOF)
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return c;
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if (yyin != stdin)
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fclose(yyin);
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yyin = NULL;
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curpfile++;
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}
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}
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char *cursource(void) /* current source file name */
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{
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if (npfile > 0)
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return pfile[curpfile < npfile ? curpfile : curpfile - 1];
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else
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return NULL;
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}
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