diff options
| -rw-r--r-- | ChangeLog | 39 | ||||
| -rw-r--r-- | TODO | 5 | ||||
| -rw-r--r-- | awk.h | 4 | ||||
| -rw-r--r-- | builtin.c | 37 | ||||
| -rw-r--r-- | doc/ChangeLog | 10 | ||||
| -rw-r--r-- | doc/gawk.info | 1183 | ||||
| -rw-r--r-- | doc/gawk.texi | 73 | ||||
| -rw-r--r-- | doc/gawktexi.in | 73 | ||||
| -rw-r--r-- | io.c | 73 | ||||
| -rw-r--r-- | test/ChangeLog | 10 | ||||
| -rw-r--r-- | test/Makefile.am | 5 | ||||
| -rw-r--r-- | test/Makefile.in | 15 | ||||
| -rw-r--r-- | test/Maketests | 10 | ||||
| -rw-r--r-- | test/nonfatal1.awk | 5 | ||||
| -rw-r--r-- | test/nonfatal1.ok | 2 | ||||
| -rw-r--r-- | test/nonfatal2.awk | 5 | ||||
| -rw-r--r-- | test/nonfatal2.ok | 1 |
17 files changed, 965 insertions, 585 deletions
@@ -26,6 +26,29 @@ * profile.c (pprint): Restore printing of count for rules. Bug report by Hermann Peifer. +2015-02-08 Arnold D. Robbins <arnold@skeeve.com> + + * io.c: Make it "NONFATAL" everywhere. + +2015-02-08 Andrew J. Schorr <aschorr@telemetry-investments.com> + + * awk.h (RED_NON_FATAL): Removed. + (redirect): Add new failure_fatal parameter. + (is_non_fatal_redirect): Add declaration. + * builtin.c (efwrite): Rework check for non-fatal. + (do_printf): Adjust calls to redirect. + (do_print_rec): Ditto. Move check for redirection error up. + * io.c (redflags2str): Remove RED_NON_FATAL. + (redirect): Add new failure_fatal parameter. Simplify the code. + (is_non_fatal_redirect): New function. + (do_getline_redir): Adjust calls to redirect. + +2014-12-27 Arnold D. Robbins <arnold@skeeve.com> + + * awk.h (is_non_fatal_std): Declare new function. + * io.c (is_non_fatal_std): New function. + * builtin.c (efwrite): Call it. + 2015-02-07 Arnold D. Robbins <arnold@skeeve.com> * regcomp.c, regex.c, regex.h, regex_internal.c, regex_internal.h, @@ -133,6 +156,22 @@ * profile.c (pprint): Be sure to set ip2 in all paths through the code. Thanks to GCC 4.9 for the warning. +2014-12-20 Arnold D. Robbins <arnold@skeeve.com> + + Enable non-fatal output on per-file or global basis, + via PROCINFO. + + * awk.h (RED_NON_FATAL): New redirection flag. + * builtin.c (efwrite): If RED_NON_FATAL set, just set ERRNO and return. + (do_printf): Check errflg and if set, set ERRNO and return. + (do_print): Ditto. + (do_print_rec): Ditto. + * io.c (redflags2str): Update table. + (redirect): Check for global PROCINFO["nonfatal"] or for + PROCINFO[file, "nonfatal"] and don't fail on open if set. + Add RED_NON_FATAL to flags. + (in_PROCINFO): Make smarter and more general. + 2014-12-12 Stephen Davies <sdavies@sdc.com.au> Improve comment handling in pretty printing. @@ -1,4 +1,4 @@ -Sun Sep 28 22:19:10 IDT 2014 +Wed Dec 24 20:41:38 IST 2014 ============================ There were too many files tracking different thoughts and ideas for @@ -44,9 +44,6 @@ Minor New Features Consider relaxing the strictness of --posix. - Make it possible to put print/printf + redirections into - an expression. - ? Add an optional base to strtonum, allowing 2-36. ? Optional third argument for index indicating where to start the @@ -1482,7 +1482,7 @@ extern void register_two_way_processor(awk_two_way_processor_t *processor); extern void set_FNR(void); extern void set_NR(void); -extern struct redirect *redirect(NODE *redir_exp, int redirtype, int *errflg); +extern struct redirect *redirect(NODE *redir_exp, int redirtype, int *errflg, bool failure_fatal); extern NODE *do_close(int nargs); extern int flush_io(void); extern int close_io(bool *stdio_problem); @@ -1494,6 +1494,8 @@ extern NODE *do_getline(int intovar, IOBUF *iop); extern struct redirect *getredirect(const char *str, int len); extern bool inrec(IOBUF *iop, int *errcode); extern int nextfile(IOBUF **curfile, bool skipping); +extern bool is_non_fatal_std(FILE *fp); +extern bool is_non_fatal_redirect(const char *str); /* main.c */ extern int arg_assign(char *arg, bool initing); extern int is_std_var(const char *var); @@ -129,10 +129,14 @@ wrerror: if (fp == stdout && errno == EPIPE) gawk_exit(EXIT_FATAL); + /* otherwise die verbosely */ - fatal(_("%s to \"%s\" failed (%s)"), from, - rp ? rp->value : _("standard output"), - errno ? strerror(errno) : _("reason unknown")); + if ((rp != NULL) ? is_non_fatal_redirect(rp->value) : is_non_fatal_std(fp)) + update_ERRNO_int(errno); + else + fatal(_("%s to \"%s\" failed (%s)"), from, + rp ? rp->value : _("standard output"), + errno ? strerror(errno) : _("reason unknown")); } /* do_exp --- exponential function */ @@ -1639,7 +1643,7 @@ do_printf(int nargs, int redirtype) FILE *fp = NULL; NODE *tmp; struct redirect *rp = NULL; - int errflg; /* not used, sigh */ + int errflg = 0; NODE *redir_exp = NULL; if (nargs == 0) { @@ -1650,7 +1654,7 @@ do_printf(int nargs, int redirtype) redir_exp = TOP(); if (redir_exp->type != Node_val) fatal(_("attempt to use array `%s' in a scalar context"), array_vname(redir_exp)); - rp = redirect(redir_exp, redirtype, & errflg); + rp = redirect(redir_exp, redirtype, & errflg, true); DEREF(redir_exp); decr_sp(); } @@ -1663,9 +1667,13 @@ do_printf(int nargs, int redirtype) redir_exp = PEEK(nargs); if (redir_exp->type != Node_val) fatal(_("attempt to use array `%s' in a scalar context"), array_vname(redir_exp)); - rp = redirect(redir_exp, redirtype, & errflg); + rp = redirect(redir_exp, redirtype, & errflg, true); if (rp != NULL) fp = rp->output.fp; + else if (errflg) { + update_ERRNO_int(errflg); + return; + } } else if (do_debug) /* only the debugger can change the default output */ fp = output_fp; else @@ -2078,7 +2086,7 @@ void do_print(int nargs, int redirtype) { struct redirect *rp = NULL; - int errflg; /* not used, sigh */ + int errflg = 0; FILE *fp = NULL; int i; NODE *redir_exp = NULL; @@ -2090,9 +2098,13 @@ do_print(int nargs, int redirtype) redir_exp = PEEK(nargs); if (redir_exp->type != Node_val) fatal(_("attempt to use array `%s' in a scalar context"), array_vname(redir_exp)); - rp = redirect(redir_exp, redirtype, & errflg); + rp = redirect(redir_exp, redirtype, & errflg, true); if (rp != NULL) fp = rp->output.fp; + else if (errflg) { + update_ERRNO_int(errflg); + return; + } } else if (do_debug) /* only the debugger can change the default output */ fp = output_fp; else @@ -2148,13 +2160,13 @@ do_print_rec(int nargs, int redirtype) FILE *fp = NULL; NODE *f0; struct redirect *rp = NULL; - int errflg; /* not used, sigh */ + int errflg = 0; NODE *redir_exp = NULL; assert(nargs == 0); if (redirtype != 0) { redir_exp = TOP(); - rp = redirect(redir_exp, redirtype, & errflg); + rp = redirect(redir_exp, redirtype, & errflg, true); if (rp != NULL) fp = rp->output.fp; DEREF(redir_exp); @@ -2162,6 +2174,11 @@ do_print_rec(int nargs, int redirtype) } else fp = output_fp; + if (errflg) { + update_ERRNO_int(errflg); + return; + } + if (fp == NULL) return; diff --git a/doc/ChangeLog b/doc/ChangeLog index 1b809580..47756846 100644 --- a/doc/ChangeLog +++ b/doc/ChangeLog @@ -42,6 +42,7 @@ 2015-02-08 Arnold D. Robbins <arnold@skeeve.com> * gawktexi.in: O'Reilly fixes. + Make non-fatal i/o use "NONFATAL". 2015-02-06 Arnold D. Robbins <arnold@skeeve.com> @@ -102,12 +103,21 @@ * gawkinet.texi: Fix capitalization in document title. * gawktexi.in: Here we go again: Starting on more O'Reilly fixes. +2014-12-27 Arnold D. Robbins <arnold@skeeve.com> + + * gawktexi.in: Add info that nonfatal I/O works with stdout and + stderr. Revise version info and what was added when. + 2014-12-26 Antonio Giovanni Colombo <azc100@gmail.com> * gawktexi.in (Glossary): Really sort the items. 2014-12-24 Arnold D. Robbins <arnold@skeeve.com> + * gawktexi.in: Start documenting nonfatal output. + +2014-12-24 Arnold D. Robbins <arnold@skeeve.com> + * gawktexi.in: Add one more paragraph to new foreword. * gawktexi.in: Fix exponentiation in TeX mode. Thanks to Marco Curreli by way of Antonio Giovanni Colombo. diff --git a/doc/gawk.info b/doc/gawk.info index 6cddc1ba..83a5d818 100644 --- a/doc/gawk.info +++ b/doc/gawk.info @@ -246,6 +246,7 @@ entitled "GNU Free Documentation License". * Special Caveats:: Things to watch out for. * Close Files And Pipes:: Closing Input and Output Files and Pipes. +* Nonfatal:: Enabling Nonfatal Output. * Output Summary:: Output summary. * Output Exercises:: Exercises. * Values:: Constants, Variables, and Regular @@ -6128,6 +6129,7 @@ function. `gawk' allows access to inherited file descriptors. * Close Files And Pipes:: Closing Input and Output Files and Pipes. +* Nonfatal:: Enabling Nonfatal Output. * Output Summary:: Output summary. * Output Exercises:: Exercises. @@ -7041,7 +7043,7 @@ that `gawk' provides: behavior. -File: gawk.info, Node: Close Files And Pipes, Next: Output Summary, Prev: Special Files, Up: Printing +File: gawk.info, Node: Close Files And Pipes, Next: Nonfatal, Prev: Special Files, Up: Printing 5.9 Closing Input and Output Redirections ========================================= @@ -7210,9 +7212,61 @@ call. See the system manual pages for information on how to decode this value. -File: gawk.info, Node: Output Summary, Next: Output Exercises, Prev: Close Files And Pipes, Up: Printing +File: gawk.info, Node: Nonfatal, Next: Output Summary, Prev: Close Files And Pipes, Up: Printing -5.10 Summary +5.10 Enabling Nonfatal Output +============================= + +This minor node describes a `gawk'-specific feature. + + In standard `awk', output with `print' or `printf' to a nonexistent +file, or some other I/O error (such as filling up the disk) is a fatal +error. + + $ gawk 'BEGIN { print "hi" > "/no/such/file" }' + error--> gawk: cmd. line:1: fatal: can't redirect to `/no/such/file' (No such file or directory) + + `gawk' makes it possible to detect that an error has occurred, +allowing you to possibly recover from the error, or at least print an +error message of your choosing before exiting. You can do this in one +of two ways: + + * For all output files, by assigning any value to + `PROCINFO["NONFATAL"]'. + + * On a per-file basis, by assigning any value to `PROCINFO[FILENAME, + "NONFATAL"]'. Here, FILENAME is the name of the file to which you + wish output to be nonfatal. + + Once you have enabled nonfatal output, you must check `ERRNO' after +every relevant `print' or `printf' statement to see if something went +wrong. It is also a good idea to initialize `ERRNO' to zero before +attempting the output. For example: + + $ gawk ' + > BEGIN { + > PROCINFO["NONFATAL"] = 1 + > ERRNO = 0 + > print "hi" > "/no/such/file" + > if (ERRNO) { + > print("Output failed:", ERRNO) > "/dev/stderr" + > exit 1 + > } + > }' + error--> Output failed: No such file or directory + + Here, `gawk' did not produce a fatal error; instead it let the `awk' +program code detect the problem and handle it. + + This mechanism works also for standard output and standard error. +For standard output, you may use `PROCINFO["-", "NONFATAL"]' or +`PROCINFO["/dev/stdout", "NONFATAL"]'. For standard error, use +`PROCINFO["/dev/stderr", "NONFATAL"]'. + + +File: gawk.info, Node: Output Summary, Next: Output Exercises, Prev: Nonfatal, Up: Printing + +5.11 Summary ============ * The `print' statement prints comma-separated expressions. Each @@ -7234,11 +7288,16 @@ File: gawk.info, Node: Output Summary, Next: Output Exercises, Prev: Close Fi For coprocesses, it is possible to close only one direction of the communications. + * Normally errors with `print' or `printf' are fatal. `gawk' lets + you make output errors be nonfatal either for all files or on a + per-file basis. You must then check for errors after every + relevant output statement. + File: gawk.info, Node: Output Exercises, Prev: Output Summary, Up: Printing -5.11 Exercises +5.12 Exercises ============== 1. Rewrite the program: @@ -26479,6 +26538,9 @@ the current version of `gawk'. - Directories on the command line produce a warning and are skipped (*note Command-line directories::) + - Output with `print' and `printf' need not be fatal (*note + Nonfatal::) + * New keywords: - The `BEGINFILE' and `ENDFILE' special patterns (*note @@ -26994,6 +27056,8 @@ in POSIX `awk', in the order they were added to `gawk'. * The maximum number of hexdecimal digits in `\x' escapes is now two. *Note Escape Sequences::. + * Nonfatal output with `print' and `printf'. *Note Nonfatal::. + * Support for MirBSD was removed. @@ -34667,560 +34731,561 @@ Index Tag Table: Node: Top1204 -Node: Foreword342225 -Node: Foreword446669 -Node: Preface48200 -Ref: Preface-Footnote-151071 -Ref: Preface-Footnote-251178 -Ref: Preface-Footnote-351411 -Node: History51553 -Node: Names53904 -Ref: Names-Footnote-154998 -Node: This Manual55144 -Ref: This Manual-Footnote-161644 -Node: Conventions61744 -Node: Manual History64081 -Ref: Manual History-Footnote-167074 -Ref: Manual History-Footnote-267115 -Node: How To Contribute67189 -Node: Acknowledgments68318 -Node: Getting Started73184 -Node: Running gawk75623 -Node: One-shot76813 -Node: Read Terminal78077 -Node: Long80108 -Node: Executable Scripts81621 -Ref: Executable Scripts-Footnote-184410 -Node: Comments84513 -Node: Quoting86995 -Node: DOS Quoting92513 -Node: Sample Data Files93188 -Node: Very Simple95783 -Node: Two Rules100682 -Node: More Complex102568 -Node: Statements/Lines105430 -Ref: Statements/Lines-Footnote-1109885 -Node: Other Features110150 -Node: When111086 -Ref: When-Footnote-1112840 -Node: Intro Summary112905 -Node: Invoking Gawk113789 -Node: Command Line115303 -Node: Options116101 -Ref: Options-Footnote-1131896 -Ref: Options-Footnote-2132125 -Node: Other Arguments132150 -Node: Naming Standard Input135098 -Node: Environment Variables136191 -Node: AWKPATH Variable136749 -Ref: AWKPATH Variable-Footnote-1140156 -Ref: AWKPATH Variable-Footnote-2140201 -Node: AWKLIBPATH Variable140461 -Node: Other Environment Variables141717 -Node: Exit Status145235 -Node: Include Files145911 -Node: Loading Shared Libraries149500 -Node: Obsolete150927 -Node: Undocumented151619 -Node: Invoking Summary151886 -Node: Regexp153549 -Node: Regexp Usage155003 -Node: Escape Sequences157040 -Node: Regexp Operators163269 -Ref: Regexp Operators-Footnote-1170679 -Ref: Regexp Operators-Footnote-2170826 -Node: Bracket Expressions170924 -Ref: table-char-classes172939 -Node: Leftmost Longest175881 -Node: Computed Regexps177183 -Node: GNU Regexp Operators180612 -Node: Case-sensitivity184284 -Ref: Case-sensitivity-Footnote-1187169 -Ref: Case-sensitivity-Footnote-2187404 -Node: Regexp Summary187512 -Node: Reading Files188979 -Node: Records191072 -Node: awk split records191805 -Node: gawk split records196734 -Ref: gawk split records-Footnote-1201273 -Node: Fields201310 -Ref: Fields-Footnote-1204088 -Node: Nonconstant Fields204174 -Ref: Nonconstant Fields-Footnote-1206412 -Node: Changing Fields206615 -Node: Field Separators212546 -Node: Default Field Splitting215250 -Node: Regexp Field Splitting216367 -Node: Single Character Fields219717 -Node: Command Line Field Separator220776 -Node: Full Line Fields223993 -Ref: Full Line Fields-Footnote-1225514 -Ref: Full Line Fields-Footnote-2225560 -Node: Field Splitting Summary225661 -Node: Constant Size227735 -Node: Splitting By Content232318 -Ref: Splitting By Content-Footnote-1236283 -Node: Multiple Line236446 -Ref: Multiple Line-Footnote-1242327 -Node: Getline242506 -Node: Plain Getline244713 -Node: Getline/Variable247353 -Node: Getline/File248502 -Node: Getline/Variable/File249887 -Ref: Getline/Variable/File-Footnote-1251490 -Node: Getline/Pipe251577 -Node: Getline/Variable/Pipe254255 -Node: Getline/Coprocess255386 -Node: Getline/Variable/Coprocess256650 -Node: Getline Notes257389 -Node: Getline Summary260183 -Ref: table-getline-variants260595 -Node: Read Timeout261424 -Ref: Read Timeout-Footnote-1265261 -Node: Command-line directories265319 -Node: Input Summary266224 -Node: Input Exercises269609 -Node: Printing270337 -Node: Print272114 -Node: Print Examples273571 -Node: Output Separators276350 -Node: OFMT278368 -Node: Printf279723 -Node: Basic Printf280508 -Node: Control Letters282080 -Node: Format Modifiers286065 -Node: Printf Examples292071 -Node: Redirection294557 -Node: Special FD301395 -Ref: Special FD-Footnote-1304561 -Node: Special Files304635 -Node: Other Inherited Files305252 -Node: Special Network306252 -Node: Special Caveats307114 -Node: Close Files And Pipes308063 -Ref: Close Files And Pipes-Footnote-1315254 -Ref: Close Files And Pipes-Footnote-2315402 -Node: Output Summary315552 -Node: Output Exercises316550 -Node: Expressions317230 -Node: Values318419 -Node: Constants319096 -Node: Scalar Constants319787 -Ref: Scalar Constants-Footnote-1320649 -Node: Nondecimal-numbers320899 -Node: Regexp Constants323909 -Node: Using Constant Regexps324435 -Node: Variables327598 -Node: Using Variables328255 -Node: Assignment Options330166 -Node: Conversion332041 -Node: Strings And Numbers332565 -Ref: Strings And Numbers-Footnote-1335630 -Node: Locale influences conversions335739 -Ref: table-locale-affects338485 -Node: All Operators339077 -Node: Arithmetic Ops339706 -Node: Concatenation342211 -Ref: Concatenation-Footnote-1345030 -Node: Assignment Ops345137 -Ref: table-assign-ops350116 -Node: Increment Ops351426 -Node: Truth Values and Conditions354857 -Node: Truth Values355940 -Node: Typing and Comparison356989 -Node: Variable Typing357805 -Node: Comparison Operators361472 -Ref: table-relational-ops361882 -Node: POSIX String Comparison365377 -Ref: POSIX String Comparison-Footnote-1366449 -Node: Boolean Ops366588 -Ref: Boolean Ops-Footnote-1371066 -Node: Conditional Exp371157 -Node: Function Calls372895 -Node: Precedence376775 -Node: Locales380435 -Node: Expressions Summary382067 -Node: Patterns and Actions384638 -Node: Pattern Overview385758 -Node: Regexp Patterns387437 -Node: Expression Patterns387980 -Node: Ranges391760 -Node: BEGIN/END394867 -Node: Using BEGIN/END395628 -Ref: Using BEGIN/END-Footnote-1398364 -Node: I/O And BEGIN/END398470 -Node: BEGINFILE/ENDFILE400785 -Node: Empty403682 -Node: Using Shell Variables403999 -Node: Action Overview406272 -Node: Statements408598 -Node: If Statement410446 -Node: While Statement411941 -Node: Do Statement413969 -Node: For Statement415117 -Node: Switch Statement418275 -Node: Break Statement420657 -Node: Continue Statement422750 -Node: Next Statement424577 -Node: Nextfile Statement426958 -Node: Exit Statement429586 -Node: Built-in Variables431997 -Node: User-modified433130 -Ref: User-modified-Footnote-1440764 -Node: Auto-set440826 -Ref: Auto-set-Footnote-1454535 -Ref: Auto-set-Footnote-2454740 -Node: ARGC and ARGV454796 -Node: Pattern Action Summary459014 -Node: Arrays461447 -Node: Array Basics462776 -Node: Array Intro463620 -Ref: figure-array-elements465554 -Ref: Array Intro-Footnote-1468174 -Node: Reference to Elements468302 -Node: Assigning Elements470764 -Node: Array Example471255 -Node: Scanning an Array473014 -Node: Controlling Scanning476034 -Ref: Controlling Scanning-Footnote-1481428 -Node: Numeric Array Subscripts481744 -Node: Uninitialized Subscripts483929 -Node: Delete485546 -Ref: Delete-Footnote-1488295 -Node: Multidimensional488352 -Node: Multiscanning491449 -Node: Arrays of Arrays493038 -Node: Arrays Summary497792 -Node: Functions499883 -Node: Built-in500922 -Node: Calling Built-in502000 -Node: Numeric Functions503995 -Ref: Numeric Functions-Footnote-1508813 -Ref: Numeric Functions-Footnote-2509170 -Ref: Numeric Functions-Footnote-3509218 -Node: String Functions509490 -Ref: String Functions-Footnote-1532991 -Ref: String Functions-Footnote-2533120 -Ref: String Functions-Footnote-3533368 -Node: Gory Details533455 -Ref: table-sub-escapes535236 -Ref: table-sub-proposed536751 -Ref: table-posix-sub538113 -Ref: table-gensub-escapes539650 -Ref: Gory Details-Footnote-1540483 -Node: I/O Functions540634 -Ref: I/O Functions-Footnote-1547870 -Node: Time Functions548017 -Ref: Time Functions-Footnote-1558526 -Ref: Time Functions-Footnote-2558594 -Ref: Time Functions-Footnote-3558752 -Ref: Time Functions-Footnote-4558863 -Ref: Time Functions-Footnote-5558975 -Ref: Time Functions-Footnote-6559202 -Node: Bitwise Functions559468 -Ref: table-bitwise-ops560030 -Ref: Bitwise Functions-Footnote-1564358 -Node: Type Functions564530 -Node: I18N Functions565682 -Node: User-defined567329 -Node: Definition Syntax568134 -Ref: Definition Syntax-Footnote-1573793 -Node: Function Example573864 -Ref: Function Example-Footnote-1576785 -Node: Function Caveats576807 -Node: Calling A Function577325 -Node: Variable Scope578283 -Node: Pass By Value/Reference581276 -Node: Return Statement584773 -Node: Dynamic Typing587752 -Node: Indirect Calls588681 -Ref: Indirect Calls-Footnote-1598546 -Node: Functions Summary598674 -Node: Library Functions601376 -Ref: Library Functions-Footnote-1604984 -Ref: Library Functions-Footnote-2605127 -Node: Library Names605298 -Ref: Library Names-Footnote-1608756 -Ref: Library Names-Footnote-2608979 -Node: General Functions609065 -Node: Strtonum Function610168 -Node: Assert Function613190 -Node: Round Function616514 -Node: Cliff Random Function618055 -Node: Ordinal Functions619071 -Ref: Ordinal Functions-Footnote-1622134 -Ref: Ordinal Functions-Footnote-2622386 -Node: Join Function622597 -Ref: Join Function-Footnote-1624367 -Node: Getlocaltime Function624567 -Node: Readfile Function628311 -Node: Shell Quoting630283 -Node: Data File Management631684 -Node: Filetrans Function632316 -Node: Rewind Function636412 -Node: File Checking637798 -Ref: File Checking-Footnote-1639131 -Node: Empty Files639332 -Node: Ignoring Assigns641311 -Node: Getopt Function642861 -Ref: Getopt Function-Footnote-1654325 -Node: Passwd Functions654525 -Ref: Passwd Functions-Footnote-1663365 -Node: Group Functions663453 -Ref: Group Functions-Footnote-1671350 -Node: Walking Arrays671555 -Node: Library Functions Summary674561 -Node: Library Exercises675963 -Node: Sample Programs677243 -Node: Running Examples678013 -Node: Clones678741 -Node: Cut Program679965 -Node: Egrep Program689685 -Ref: Egrep Program-Footnote-1697188 -Node: Id Program697298 -Node: Split Program700974 -Ref: Split Program-Footnote-1704428 -Node: Tee Program704556 -Node: Uniq Program707345 -Node: Wc Program714764 -Ref: Wc Program-Footnote-1719014 -Node: Miscellaneous Programs719108 -Node: Dupword Program720321 -Node: Alarm Program722352 -Node: Translate Program727157 -Ref: Translate Program-Footnote-1731720 -Node: Labels Program731990 -Ref: Labels Program-Footnote-1735341 -Node: Word Sorting735425 -Node: History Sorting739495 -Node: Extract Program741330 -Node: Simple Sed748854 -Node: Igawk Program751924 -Ref: Igawk Program-Footnote-1766250 -Ref: Igawk Program-Footnote-2766451 -Ref: Igawk Program-Footnote-3766573 -Node: Anagram Program766688 -Node: Signature Program769749 -Node: Programs Summary770996 -Node: Programs Exercises772217 -Ref: Programs Exercises-Footnote-1776348 -Node: Advanced Features776439 -Node: Nondecimal Data778421 -Node: Array Sorting780011 -Node: Controlling Array Traversal780711 -Ref: Controlling Array Traversal-Footnote-1789077 -Node: Array Sorting Functions789195 -Ref: Array Sorting Functions-Footnote-1793081 -Node: Two-way I/O793277 -Ref: Two-way I/O-Footnote-1798222 -Ref: Two-way I/O-Footnote-2798408 -Node: TCP/IP Networking798490 -Node: Profiling801362 -Node: Advanced Features Summary809633 -Node: Internationalization811566 -Node: I18N and L10N813046 -Node: Explaining gettext813732 -Ref: Explaining gettext-Footnote-1818757 -Ref: Explaining gettext-Footnote-2818941 -Node: Programmer i18n819106 -Ref: Programmer i18n-Footnote-1823982 -Node: Translator i18n824031 -Node: String Extraction824825 -Ref: String Extraction-Footnote-1825956 -Node: Printf Ordering826042 -Ref: Printf Ordering-Footnote-1828828 -Node: I18N Portability828892 -Ref: I18N Portability-Footnote-1831348 -Node: I18N Example831411 -Ref: I18N Example-Footnote-1834214 -Node: Gawk I18N834286 -Node: I18N Summary834930 -Node: Debugger836270 -Node: Debugging837292 -Node: Debugging Concepts837733 -Node: Debugging Terms839543 -Node: Awk Debugging842115 -Node: Sample Debugging Session843021 -Node: Debugger Invocation843555 -Node: Finding The Bug844940 -Node: List of Debugger Commands851419 -Node: Breakpoint Control852751 -Node: Debugger Execution Control856428 -Node: Viewing And Changing Data859787 -Node: Execution Stack863163 -Node: Debugger Info864798 -Node: Miscellaneous Debugger Commands868843 -Node: Readline Support873844 -Node: Limitations874738 -Node: Debugging Summary876853 -Node: Arbitrary Precision Arithmetic878027 -Node: Computer Arithmetic879443 -Ref: table-numeric-ranges883042 -Ref: Computer Arithmetic-Footnote-1883566 -Node: Math Definitions883623 -Ref: table-ieee-formats886918 -Ref: Math 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+Node: Old Extension Problems1175006 +Ref: Old Extension Problems-Footnote-11176523 +Node: Extension New Mechanism Goals1176580 +Ref: Extension New Mechanism Goals-Footnote-11179940 +Node: Extension Other Design Decisions1180129 +Node: Extension Future Growth1182237 +Node: Old Extension Mechanism1183073 +Node: Notes summary1184835 +Node: Basic Concepts1186021 +Node: Basic High Level1186702 +Ref: figure-general-flow1186974 +Ref: figure-process-flow1187573 +Ref: Basic High Level-Footnote-11190802 +Node: Basic Data Typing1190987 +Node: Glossary1194315 +Node: Copying1226244 +Node: GNU Free Documentation License1263800 +Node: Index1288936 End Tag Table diff --git a/doc/gawk.texi b/doc/gawk.texi index 023f2719..9044c604 100644 --- a/doc/gawk.texi +++ b/doc/gawk.texi @@ -633,6 +633,7 @@ particular records in a file and perform operations upon them. * Special Caveats:: Things to watch out for. * Close Files And Pipes:: Closing Input and Output Files and Pipes. +* Nonfatal:: Enabling Nonfatal Output. * Output Summary:: Output summary. * Output Exercises:: Exercises. * Values:: Constants, Variables, and Regular @@ -8935,6 +8936,7 @@ and discusses the @code{close()} built-in function. @command{gawk} allows access to inherited file descriptors. * Close Files And Pipes:: Closing Input and Output Files and Pipes. +* Nonfatal:: Enabling Nonfatal Output. * Output Summary:: Output summary. * Output Exercises:: Exercises. @end menu @@ -10441,6 +10443,63 @@ when closing a pipe. @end ifnotdocbook +@node Nonfatal +@section Enabling Nonfatal Output + +This @value{SECTION} describes a @command{gawk}-specific feature. + +In standard @command{awk}, output with @code{print} or @code{printf} +to a nonexistent file, or some other I/O error (such as filling up the +disk) is a fatal error. + +@example +$ @kbd{gawk 'BEGIN @{ print "hi" > "/no/such/file" @}'} +@error{} gawk: cmd. line:1: fatal: can't redirect to `/no/such/file' (No such file or directory) +@end example + +@command{gawk} makes it possible to detect that an error has +occurred, allowing you to possibly recover from the error, or +at least print an error message of your choosing before exiting. +You can do this in one of two ways: + +@itemize @bullet +@item +For all output files, by assigning any value to @code{PROCINFO["NONFATAL"]}. + +@item +On a per-file basis, by assigning any value to +@code{PROCINFO[@var{filename}, "NONFATAL"]}. +Here, @var{filename} is the name of the file to which +you wish output to be nonfatal. +@end itemize + +Once you have enabled nonfatal output, you must check @code{ERRNO} +after every relevant @code{print} or @code{printf} statement to +see if something went wrong. It is also a good idea to initialize +@code{ERRNO} to zero before attempting the output. For example: + +@example +$ @kbd{gawk '} +> @kbd{BEGIN @{} +> @kbd{ PROCINFO["NONFATAL"] = 1} +> @kbd{ ERRNO = 0} +> @kbd{ print "hi" > "/no/such/file"} +> @kbd{ if (ERRNO) @{} +> @kbd{ print("Output failed:", ERRNO) > "/dev/stderr"} +> @kbd{ exit 1} +> @kbd{ @}} +> @kbd{@}'} +@error{} Output failed: No such file or directory +@end example + +Here, @command{gawk} did not produce a fatal error; instead +it let the @command{awk} program code detect the problem and handle it. + +This mechanism works also for standard output and standard error. +For standard output, you may use @code{PROCINFO["-", "NONFATAL"]} +or @code{PROCINFO["/dev/stdout", "NONFATAL"]}. For standard error, use +@code{PROCINFO["/dev/stderr", "NONFATAL"]}. + @node Output Summary @section Summary @@ -10469,6 +10528,12 @@ Use @code{close()} to close open file, pipe, and coprocess redirections. For coprocesses, it is possible to close only one direction of the communications. +@item +Normally errors with @code{print} or @code{printf} are fatal. +@command{gawk} lets you make output errors be nonfatal either for +all files or on a per-file basis. You must then check for errors +after every relevant output statement. + @end itemize @c EXCLUDE START @@ -35700,6 +35765,10 @@ Indirect function calls @item Directories on the command line produce a warning and are skipped (@pxref{Command-line directories}) + +@item +Output with @code{print} and @code{printf} need not be fatal +(@pxref{Nonfatal}) @end itemize @item @@ -36579,6 +36648,10 @@ is now two. @xref{Escape Sequences}. @item +Nonfatal output with @code{print} and @code{printf}. +@xref{Nonfatal}. + +@item Support for MirBSD was removed. @end itemize diff --git a/doc/gawktexi.in b/doc/gawktexi.in index ba65f9f6..61d5038e 100644 --- a/doc/gawktexi.in +++ b/doc/gawktexi.in @@ -628,6 +628,7 @@ particular records in a file and perform operations upon them. * Special Caveats:: Things to watch out for. * Close Files And Pipes:: Closing Input and Output Files and Pipes. +* Nonfatal:: Enabling Nonfatal Output. * Output Summary:: Output summary. * Output Exercises:: Exercises. * Values:: Constants, Variables, and Regular @@ -8535,6 +8536,7 @@ and discusses the @code{close()} built-in function. @command{gawk} allows access to inherited file descriptors. * Close Files And Pipes:: Closing Input and Output Files and Pipes. +* Nonfatal:: Enabling Nonfatal Output. * Output Summary:: Output summary. * Output Exercises:: Exercises. @end menu @@ -9937,6 +9939,63 @@ when closing a pipe. @end sidebar +@node Nonfatal +@section Enabling Nonfatal Output + +This @value{SECTION} describes a @command{gawk}-specific feature. + +In standard @command{awk}, output with @code{print} or @code{printf} +to a nonexistent file, or some other I/O error (such as filling up the +disk) is a fatal error. + +@example +$ @kbd{gawk 'BEGIN @{ print "hi" > "/no/such/file" @}'} +@error{} gawk: cmd. line:1: fatal: can't redirect to `/no/such/file' (No such file or directory) +@end example + +@command{gawk} makes it possible to detect that an error has +occurred, allowing you to possibly recover from the error, or +at least print an error message of your choosing before exiting. +You can do this in one of two ways: + +@itemize @bullet +@item +For all output files, by assigning any value to @code{PROCINFO["NONFATAL"]}. + +@item +On a per-file basis, by assigning any value to +@code{PROCINFO[@var{filename}, "NONFATAL"]}. +Here, @var{filename} is the name of the file to which +you wish output to be nonfatal. +@end itemize + +Once you have enabled nonfatal output, you must check @code{ERRNO} +after every relevant @code{print} or @code{printf} statement to +see if something went wrong. It is also a good idea to initialize +@code{ERRNO} to zero before attempting the output. For example: + +@example +$ @kbd{gawk '} +> @kbd{BEGIN @{} +> @kbd{ PROCINFO["NONFATAL"] = 1} +> @kbd{ ERRNO = 0} +> @kbd{ print "hi" > "/no/such/file"} +> @kbd{ if (ERRNO) @{} +> @kbd{ print("Output failed:", ERRNO) > "/dev/stderr"} +> @kbd{ exit 1} +> @kbd{ @}} +> @kbd{@}'} +@error{} Output failed: No such file or directory +@end example + +Here, @command{gawk} did not produce a fatal error; instead +it let the @command{awk} program code detect the problem and handle it. + +This mechanism works also for standard output and standard error. +For standard output, you may use @code{PROCINFO["-", "NONFATAL"]} +or @code{PROCINFO["/dev/stdout", "NONFATAL"]}. For standard error, use +@code{PROCINFO["/dev/stderr", "NONFATAL"]}. + @node Output Summary @section Summary @@ -9965,6 +10024,12 @@ Use @code{close()} to close open file, pipe, and coprocess redirections. For coprocesses, it is possible to close only one direction of the communications. +@item +Normally errors with @code{print} or @code{printf} are fatal. +@command{gawk} lets you make output errors be nonfatal either for +all files or on a per-file basis. You must then check for errors +after every relevant output statement. + @end itemize @c EXCLUDE START @@ -34791,6 +34856,10 @@ Indirect function calls @item Directories on the command line produce a warning and are skipped (@pxref{Command-line directories}) + +@item +Output with @code{print} and @code{printf} need not be fatal +(@pxref{Nonfatal}) @end itemize @item @@ -35670,6 +35739,10 @@ is now two. @xref{Escape Sequences}. @item +Nonfatal output with @code{print} and @code{printf}. +@xref{Nonfatal}. + +@item Support for MirBSD was removed. @end itemize @@ -261,7 +261,6 @@ struct recmatch { static int iop_close(IOBUF *iop); -struct redirect *redirect(NODE *redir_exp, int redirtype, int *errflg); static void close_one(void); static int close_redir(struct redirect *rp, bool exitwarn, two_way_close_type how); #ifndef PIPES_SIMULATED @@ -727,7 +726,7 @@ redflags2str(int flags) /* redirect --- Redirection for printf and print commands */ struct redirect * -redirect(NODE *redir_exp, int redirtype, int *errflg) +redirect(NODE *redir_exp, int redirtype, int *errflg, bool failure_fatal) { struct redirect *rp; char *str; @@ -892,6 +891,12 @@ redirect(NODE *redir_exp, int redirtype, int *errflg) (void) flush_io(); os_restore_mode(fileno(stdin)); + /* + * Don't check failure_fatal; see input pipe below. + * Note that the failure happens upon failure to fork, + * using a non-existant program will still succeed the + * popen(). + */ if ((rp->output.fp = popen(str, binmode("w"))) == NULL) fatal(_("can't open pipe `%s' for output (%s)"), str, strerror(errno)); @@ -927,13 +932,11 @@ redirect(NODE *redir_exp, int redirtype, int *errflg) case redirect_twoway: direction = "to/from"; if (! two_way_open(str, rp)) { -#ifdef HAVE_SOCKETS - if (inetfile(str, NULL)) { + if (! failure_fatal || is_non_fatal_redirect(str)) { *errflg = errno; /* do not free rp, saving it for reuse (save_rp = rp) */ return NULL; } else -#endif fatal(_("can't open two way pipe `%s' for input/output (%s)"), str, strerror(errno)); } @@ -1009,11 +1012,14 @@ redirect(NODE *redir_exp, int redirtype, int *errflg) * can return -1. For output to file, * complain. The shell will complain on * a bad command to a pipe. + * + * 12/2014: Take nonfatal settings in PROCINFO into account. */ if (errflg != NULL) *errflg = errno; - if ( redirtype == redirect_output - || redirtype == redirect_append) { + if (failure_fatal && ! is_non_fatal_redirect(str) && + (redirtype == redirect_output + || redirtype == redirect_append)) { /* multiple messages make life easier for translators */ if (*direction == 'f') fatal(_("can't redirect from `%s' (%s)"), @@ -1058,6 +1064,36 @@ getredirect(const char *str, int len) return NULL; } +/* is_non_fatal_std --- return true if fp is stdout/stderr and nonfatal */ + +bool +is_non_fatal_std(FILE *fp) +{ + static const char nonfatal[] = "NONFATAL"; + + if (in_PROCINFO(nonfatal, NULL, NULL)) + return true; + + /* yucky logic. sigh. */ + if (fp == stdout) { + return ( in_PROCINFO("-", nonfatal, NULL) != NULL + || in_PROCINFO("/dev/stdout", nonfatal, NULL) != NULL); + } else if (fp == stderr) { + return (in_PROCINFO("/dev/stderr", nonfatal, NULL) != NULL); + } + + return false; +} + +/* is_non_fatal_redirect --- return true if redirected I/O should be nonfatal */ + +bool +is_non_fatal_redirect(const char *str) +{ + return in_PROCINFO("NONFATAL", NULL, NULL) != NULL + || in_PROCINFO(str, "NONFATAL", NULL) != NULL; +} + /* close_one --- temporarily close an open file to re-use the fd */ static void @@ -2421,7 +2457,7 @@ do_getline_redir(int into_variable, enum redirval redirtype) assert(redirtype != redirect_none); redir_exp = TOP(); - rp = redirect(redir_exp, redirtype, & redir_error); + rp = redirect(redir_exp, redirtype, & redir_error, false); DEREF(redir_exp); decr_sp(); if (rp == NULL) { @@ -3799,12 +3835,21 @@ in_PROCINFO(const char *pidx1, const char *pidx2, NODE **full_idx) NODE *r, *sub = NULL; NODE *subsep = SUBSEP_node->var_value; + if (PROCINFO_node == NULL || (pidx1 == NULL && pidx2 == NULL)) + return NULL; + /* full_idx is in+out parameter */ if (full_idx) sub = *full_idx; - str_len = strlen(pidx1) + subsep->stlen + strlen(pidx2); + if (pidx1 != NULL && pidx2 == NULL) + str_len = strlen(pidx1); + else if (pidx1 == NULL && pidx2 != NULL) + str_len = strlen(pidx2); + else + str_len = strlen(pidx1) + subsep->stlen + strlen(pidx2); + if (sub == NULL) { emalloc(str, char *, str_len + 1, "in_PROCINFO"); sub = make_str_node(str, str_len, ALREADY_MALLOCED); @@ -3818,8 +3863,14 @@ in_PROCINFO(const char *pidx1, const char *pidx2, NODE **full_idx) sub->stlen = str_len; } - sprintf(sub->stptr, "%s%.*s%s", pidx1, (int)subsep->stlen, - subsep->stptr, pidx2); + if (pidx1 != NULL && pidx2 == NULL) + strcpy(sub->stptr, pidx1); + else if (pidx1 == NULL && pidx2 != NULL) + strcpy(sub->stptr, pidx2); + else + sprintf(sub->stptr, "%s%.*s%s", pidx1, (int)subsep->stlen, + subsep->stptr, pidx2); + r = in_array(PROCINFO_node, sub); if (! full_idx) unref(sub); diff --git a/test/ChangeLog b/test/ChangeLog index b0603e50..43482705 100644 --- a/test/ChangeLog +++ b/test/ChangeLog @@ -13,6 +13,16 @@ * Makefile.am (profile0): New test. * profile0.awk, profile0.in, profile0.ok: New files. +2015-02-08 Arnold D. Robbins <arnold@skeeve.com> + + * nonfatal1.awk, nonfatal2.awk: String is now "NONFATAL". + +2015-02-06 Arnold D. Robbins <arnold@skeeve.com> + + * Makefile.am (nonfatal1, nonfatal2): New tests. + * nonfatal1.awk, nonfatal1.ok: New files. + * nonfatal2.awk, nonfatal2.ok: New files. + 2015-02-01 Arnold D. Robbins <arnold@skeeve.com> * Makefile.am (paramasfunc1, paramasfunc2): Now need --posix. diff --git a/test/Makefile.am b/test/Makefile.am index e752865a..1d652eca 100644 --- a/test/Makefile.am +++ b/test/Makefile.am @@ -599,6 +599,10 @@ EXTRA_DIST = \ nondec.ok \ nondec2.awk \ nondec2.ok \ + nonfatal1.awk \ + nonfatal1.ok \ + nonfatal2.awk \ + nonfatal2.ok \ nonl.awk \ nonl.ok \ noparms.awk \ @@ -1047,6 +1051,7 @@ GAWK_EXT_TESTS = \ lint lintold lintwarn \ manyfiles match1 match2 match3 mbstr1 \ nastyparm next nondec nondec2 \ + nonfatal1 nonfatal2 \ patsplit posix printfbad1 printfbad2 printfbad3 printfbad4 printhuge procinfs \ profile0 profile1 profile2 profile3 profile4 profile5 profile6 profile7 \ profile8 pty1 \ diff --git a/test/Makefile.in b/test/Makefile.in index 0c00973c..65fd461a 100644 --- a/test/Makefile.in +++ b/test/Makefile.in @@ -856,6 +856,10 @@ EXTRA_DIST = \ nondec.ok \ nondec2.awk \ nondec2.ok \ + nonfatal1.awk \ + nonfatal1.ok \ + nonfatal2.awk \ + nonfatal2.ok \ nonl.awk \ nonl.ok \ noparms.awk \ @@ -1303,6 +1307,7 @@ GAWK_EXT_TESTS = \ lint lintold lintwarn \ manyfiles match1 match2 match3 mbstr1 \ nastyparm next nondec nondec2 \ + nonfatal1 nonfatal2 \ patsplit posix printfbad1 printfbad2 printfbad3 printfbad4 printhuge procinfs \ profile0 profile1 profile2 profile3 profile4 profile5 profile6 profile7 \ profile8 pty1 \ @@ -3636,6 +3641,16 @@ nondec: @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ @-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@ +nonfatal1: + @echo $@ + @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ + @-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@ + +nonfatal2: + @echo $@ + @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ + @-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@ + patsplit: @echo $@ @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ diff --git a/test/Maketests b/test/Maketests index adf95cc5..c9e6a840 100644 --- a/test/Maketests +++ b/test/Maketests @@ -1152,6 +1152,16 @@ nondec: @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ @-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@ +nonfatal1: + @echo $@ + @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ + @-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@ + +nonfatal2: + @echo $@ + @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ + @-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@ + patsplit: @echo $@ @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ diff --git a/test/nonfatal1.awk b/test/nonfatal1.awk new file mode 100644 index 00000000..bf821d49 --- /dev/null +++ b/test/nonfatal1.awk @@ -0,0 +1,5 @@ +BEGIN { + PROCINFO["NONFATAL"] + print |& "/inet/tcp/0/ti10/357" + print ERRNO +} diff --git a/test/nonfatal1.ok b/test/nonfatal1.ok new file mode 100644 index 00000000..b96b8e27 --- /dev/null +++ b/test/nonfatal1.ok @@ -0,0 +1,2 @@ +gawk: nonfatal1.awk:3: fatal: remote host and port information (ti10, 357) invalid +EXIT CODE: 2 diff --git a/test/nonfatal2.awk b/test/nonfatal2.awk new file mode 100644 index 00000000..fedbba43 --- /dev/null +++ b/test/nonfatal2.awk @@ -0,0 +1,5 @@ +BEGIN { + PROCINFO["NONFATAL"] = 1 + print > "/dev/no/such/file" + print ERRNO +} diff --git a/test/nonfatal2.ok b/test/nonfatal2.ok new file mode 100644 index 00000000..ddc88691 --- /dev/null +++ b/test/nonfatal2.ok @@ -0,0 +1 @@ +No such file or directory |