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
@@ -20,6 +20,29 @@ * 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, @@ -127,6 +150,22 @@ * 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 093b25bb..5420ce97 100644 --- a/doc/ChangeLog +++ b/doc/ChangeLog @@ -17,6 +17,7 @@ 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> @@ -77,12 +78,21 @@ * 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 Columbo. diff --git a/doc/gawk.info b/doc/gawk.info index afdc99b9..2537830e 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-154997 -Node: This Manual55143 -Ref: This Manual-Footnote-161643 -Node: Conventions61743 -Node: Manual History64080 -Ref: Manual History-Footnote-167073 -Ref: Manual History-Footnote-267114 -Node: How To Contribute67188 -Node: Acknowledgments68317 -Node: Getting Started73183 -Node: Running gawk75622 -Node: One-shot76812 -Node: Read Terminal78076 -Node: Long80107 -Node: Executable Scripts81620 -Ref: Executable Scripts-Footnote-184409 -Node: Comments84512 -Node: Quoting86994 -Node: DOS Quoting92512 -Node: Sample Data Files93187 -Node: Very Simple95782 -Node: Two Rules100681 -Node: More Complex102567 -Node: Statements/Lines105429 -Ref: Statements/Lines-Footnote-1109884 -Node: Other Features110149 -Node: When111085 -Ref: When-Footnote-1112839 -Node: Intro Summary112904 -Node: Invoking Gawk113788 -Node: Command Line115302 -Node: Options116100 -Ref: Options-Footnote-1131895 -Ref: Options-Footnote-2132124 -Node: Other Arguments132149 -Node: Naming Standard Input135097 -Node: Environment Variables136190 -Node: AWKPATH Variable136748 -Ref: AWKPATH Variable-Footnote-1140155 -Ref: AWKPATH Variable-Footnote-2140200 -Node: AWKLIBPATH Variable140460 -Node: Other Environment Variables141716 -Node: Exit Status145234 -Node: Include Files145910 -Node: Loading Shared Libraries149499 -Node: Obsolete150926 -Node: Undocumented151618 -Node: Invoking Summary151885 -Node: Regexp153548 -Node: Regexp Usage155002 -Node: Escape Sequences157039 -Node: Regexp Operators163268 -Ref: Regexp Operators-Footnote-1170678 -Ref: Regexp Operators-Footnote-2170825 -Node: Bracket Expressions170923 -Ref: table-char-classes172938 -Node: Leftmost Longest175880 -Node: Computed Regexps177182 -Node: GNU Regexp Operators180611 -Node: Case-sensitivity184283 -Ref: Case-sensitivity-Footnote-1187168 -Ref: Case-sensitivity-Footnote-2187403 -Node: Regexp Summary187511 -Node: Reading Files188978 -Node: Records191071 -Node: awk split records191804 -Node: gawk split records196733 -Ref: gawk split records-Footnote-1201272 -Node: Fields201309 -Ref: Fields-Footnote-1204087 -Node: Nonconstant Fields204173 -Ref: Nonconstant Fields-Footnote-1206411 -Node: Changing Fields206614 -Node: Field Separators212545 -Node: Default Field Splitting215249 -Node: Regexp Field Splitting216366 -Node: Single Character Fields219716 -Node: Command Line Field Separator220775 -Node: Full Line Fields223992 -Ref: Full Line Fields-Footnote-1225513 -Ref: Full Line Fields-Footnote-2225559 -Node: Field Splitting Summary225660 -Node: Constant Size227734 -Node: Splitting By Content232317 -Ref: Splitting By Content-Footnote-1236282 -Node: Multiple Line236445 -Ref: Multiple Line-Footnote-1242326 -Node: Getline242505 -Node: Plain Getline244712 -Node: Getline/Variable247352 -Node: Getline/File248501 -Node: Getline/Variable/File249886 -Ref: Getline/Variable/File-Footnote-1251489 -Node: Getline/Pipe251576 -Node: Getline/Variable/Pipe254254 -Node: Getline/Coprocess255385 -Node: Getline/Variable/Coprocess256649 -Node: Getline Notes257388 -Node: Getline Summary260182 -Ref: table-getline-variants260594 -Node: Read Timeout261423 -Ref: Read Timeout-Footnote-1265260 -Node: Command-line directories265318 -Node: Input Summary266223 -Node: Input Exercises269608 -Node: Printing270336 -Node: Print272113 -Node: Print Examples273570 -Node: Output Separators276349 -Node: OFMT278367 -Node: Printf279722 -Node: Basic Printf280507 -Node: Control Letters282079 -Node: Format Modifiers286064 -Node: Printf Examples292074 -Node: Redirection294560 -Node: Special FD301398 -Ref: Special FD-Footnote-1304564 -Node: Special Files304638 -Node: Other Inherited Files305255 -Node: Special Network306255 -Node: Special Caveats307117 -Node: Close Files And Pipes308066 -Ref: Close Files And Pipes-Footnote-1315257 -Ref: Close Files And Pipes-Footnote-2315405 -Node: Output Summary315555 -Node: Output Exercises316553 -Node: Expressions317233 -Node: Values318422 -Node: Constants319099 -Node: Scalar Constants319790 -Ref: Scalar Constants-Footnote-1320652 -Node: Nondecimal-numbers320902 -Node: Regexp Constants323912 -Node: Using Constant Regexps324438 -Node: Variables327601 -Node: Using Variables328258 -Node: Assignment Options330169 -Node: Conversion332044 -Node: Strings And Numbers332568 -Ref: Strings And Numbers-Footnote-1335633 -Node: Locale influences conversions335742 -Ref: table-locale-affects338488 -Node: All Operators339080 -Node: Arithmetic Ops339709 -Node: Concatenation342214 -Ref: Concatenation-Footnote-1345033 -Node: Assignment Ops345140 -Ref: table-assign-ops350119 -Node: Increment Ops351429 -Node: Truth Values and Conditions354860 -Node: Truth Values355943 -Node: Typing and Comparison356992 -Node: Variable Typing357808 -Node: Comparison Operators361475 -Ref: table-relational-ops361885 -Node: POSIX String Comparison365380 -Ref: POSIX String Comparison-Footnote-1366452 -Node: Boolean Ops366591 -Ref: Boolean Ops-Footnote-1371069 -Node: Conditional Exp371160 -Node: Function Calls372898 -Node: Precedence376778 -Node: Locales380438 -Node: Expressions Summary382070 -Node: Patterns and Actions384641 -Node: Pattern Overview385761 -Node: Regexp Patterns387440 -Node: Expression Patterns387983 -Node: Ranges391763 -Node: BEGIN/END394870 -Node: Using BEGIN/END395631 -Ref: Using BEGIN/END-Footnote-1398367 -Node: I/O And BEGIN/END398473 -Node: BEGINFILE/ENDFILE400788 -Node: Empty403685 -Node: Using Shell Variables404002 -Node: Action Overview406275 -Node: Statements408601 -Node: If Statement410449 -Node: While Statement411944 -Node: Do Statement413972 -Node: For Statement415120 -Node: Switch Statement418278 -Node: Break Statement420660 -Node: Continue Statement422701 -Node: Next Statement424528 -Node: Nextfile Statement426909 -Node: Exit Statement429537 -Node: Built-in Variables431948 -Node: User-modified433081 -Ref: User-modified-Footnote-1440784 -Node: Auto-set440846 -Ref: Auto-set-Footnote-1454555 -Ref: Auto-set-Footnote-2454760 -Node: ARGC and ARGV454816 -Node: Pattern Action Summary459034 -Node: Arrays461467 -Node: Array Basics462796 -Node: Array Intro463640 -Ref: figure-array-elements465574 -Ref: Array Intro-Footnote-1468194 -Node: Reference to Elements468322 -Node: Assigning Elements470784 -Node: Array Example471275 -Node: Scanning an Array473034 -Node: Controlling Scanning476054 -Ref: Controlling Scanning-Footnote-1481448 -Node: Numeric Array Subscripts481764 -Node: Uninitialized Subscripts483949 -Node: Delete485566 -Ref: Delete-Footnote-1488315 -Node: Multidimensional488372 -Node: Multiscanning491469 -Node: Arrays of Arrays493058 -Node: Arrays Summary497812 -Node: Functions499903 -Node: Built-in500942 -Node: Calling Built-in502020 -Node: Numeric Functions504015 -Ref: Numeric Functions-Footnote-1508833 -Ref: Numeric Functions-Footnote-2509190 -Ref: Numeric Functions-Footnote-3509238 -Node: String Functions509510 -Ref: String Functions-Footnote-1533011 -Ref: String Functions-Footnote-2533140 -Ref: String Functions-Footnote-3533388 -Node: Gory Details533475 -Ref: table-sub-escapes535256 -Ref: table-sub-proposed536771 -Ref: table-posix-sub538133 -Ref: table-gensub-escapes539670 -Ref: Gory Details-Footnote-1540503 -Node: I/O Functions540654 -Ref: I/O Functions-Footnote-1547890 -Node: Time Functions548037 -Ref: Time Functions-Footnote-1558546 -Ref: Time Functions-Footnote-2558614 -Ref: Time Functions-Footnote-3558772 -Ref: Time Functions-Footnote-4558883 -Ref: Time Functions-Footnote-5558995 -Ref: Time Functions-Footnote-6559222 -Node: Bitwise Functions559488 -Ref: table-bitwise-ops560050 -Ref: Bitwise Functions-Footnote-1564378 -Node: Type Functions564550 -Node: I18N Functions565702 -Node: User-defined567349 -Node: Definition Syntax568154 -Ref: Definition Syntax-Footnote-1573813 -Node: Function Example573884 -Ref: Function Example-Footnote-1576805 -Node: Function Caveats576827 -Node: Calling A Function577345 -Node: Variable Scope578303 -Node: Pass By Value/Reference581296 -Node: Return Statement584793 -Node: Dynamic Typing587772 -Node: Indirect Calls588701 -Ref: Indirect Calls-Footnote-1600007 -Node: Functions Summary600135 -Node: Library Functions602837 -Ref: Library Functions-Footnote-1606445 -Ref: Library Functions-Footnote-2606588 -Node: Library Names606759 -Ref: Library Names-Footnote-1610217 -Ref: Library Names-Footnote-2610440 -Node: General Functions610526 -Node: Strtonum Function611629 -Node: Assert Function614651 -Node: Round Function617975 -Node: Cliff Random Function619516 -Node: Ordinal Functions620532 -Ref: Ordinal Functions-Footnote-1623595 -Ref: Ordinal Functions-Footnote-2623847 -Node: Join Function624058 -Ref: Join Function-Footnote-1625828 -Node: Getlocaltime Function626028 -Node: Readfile Function629772 -Node: Shell Quoting631744 -Node: Data File Management633145 -Node: Filetrans Function633777 -Node: Rewind Function637873 -Node: File Checking639259 -Ref: File Checking-Footnote-1640592 -Node: Empty Files640793 -Node: Ignoring Assigns642772 -Node: Getopt Function644322 -Ref: Getopt Function-Footnote-1655786 -Node: Passwd Functions655986 -Ref: Passwd Functions-Footnote-1664826 -Node: Group Functions664914 -Ref: Group Functions-Footnote-1672811 -Node: Walking Arrays673016 -Node: Library Functions Summary674616 -Node: Library Exercises676020 -Node: Sample Programs677300 -Node: Running Examples678070 -Node: Clones678798 -Node: Cut Program680022 -Node: Egrep Program689742 -Ref: Egrep Program-Footnote-1697245 -Node: Id Program697355 -Node: Split Program701031 -Ref: Split Program-Footnote-1704485 -Node: Tee Program704613 -Node: Uniq Program707402 -Node: Wc Program714821 -Ref: Wc Program-Footnote-1719071 -Node: Miscellaneous Programs719165 -Node: Dupword Program720378 -Node: Alarm Program722409 -Node: Translate Program727214 -Ref: Translate Program-Footnote-1731777 -Node: Labels Program732047 -Ref: Labels Program-Footnote-1735398 -Node: Word Sorting735482 -Node: History Sorting739552 -Node: Extract Program741387 -Node: Simple Sed748911 -Node: Igawk Program751981 -Ref: Igawk Program-Footnote-1766307 -Ref: Igawk Program-Footnote-2766508 -Ref: Igawk Program-Footnote-3766630 -Node: Anagram Program766745 -Node: Signature Program769806 -Node: Programs Summary771053 -Node: Programs Exercises772274 -Ref: Programs Exercises-Footnote-1776405 -Node: Advanced Features776496 -Node: Nondecimal Data778478 -Node: Array Sorting780068 -Node: Controlling Array Traversal780768 -Ref: Controlling Array Traversal-Footnote-1789134 -Node: Array Sorting Functions789252 -Ref: Array Sorting Functions-Footnote-1793138 -Node: Two-way I/O793334 -Ref: Two-way I/O-Footnote-1798279 -Ref: Two-way I/O-Footnote-2798465 -Node: TCP/IP Networking798547 -Node: Profiling801419 -Node: Advanced Features Summary809690 -Node: Internationalization811623 -Node: I18N and L10N813103 -Node: Explaining gettext813789 -Ref: Explaining gettext-Footnote-1818814 -Ref: Explaining gettext-Footnote-2818998 -Node: Programmer i18n819163 -Ref: Programmer i18n-Footnote-1824039 -Node: Translator i18n824088 -Node: String Extraction824882 -Ref: String Extraction-Footnote-1826013 -Node: Printf Ordering826099 -Ref: Printf Ordering-Footnote-1828885 -Node: I18N Portability828949 -Ref: I18N Portability-Footnote-1831405 -Node: I18N Example831468 -Ref: I18N Example-Footnote-1834271 -Node: Gawk I18N834343 -Node: I18N Summary834987 -Node: Debugger836327 -Node: Debugging837349 -Node: Debugging Concepts837790 -Node: Debugging Terms839600 -Node: Awk Debugging842172 -Node: Sample Debugging Session843078 -Node: Debugger Invocation843612 -Node: Finding The Bug844997 -Node: List of Debugger Commands851476 -Node: Breakpoint Control852808 -Node: Debugger Execution Control856485 -Node: Viewing And Changing Data859844 -Node: Execution Stack863220 -Node: Debugger Info864855 -Node: Miscellaneous Debugger Commands868900 -Node: Readline Support873901 -Node: Limitations874795 -Node: Debugging Summary876910 -Node: Arbitrary Precision Arithmetic878084 -Node: Computer Arithmetic879500 -Ref: table-numeric-ranges883099 -Ref: Computer Arithmetic-Footnote-1883623 -Node: Math Definitions883680 -Ref: table-ieee-formats886975 -Ref: Math 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+Node: Old Extension Problems1175068 +Ref: Old Extension Problems-Footnote-11176585 +Node: Extension New Mechanism Goals1176642 +Ref: Extension New Mechanism Goals-Footnote-11180002 +Node: Extension Other Design Decisions1180191 +Node: Extension Future Growth1182299 +Node: Old Extension Mechanism1183135 +Node: Notes summary1184897 +Node: Basic Concepts1186083 +Node: Basic High Level1186764 +Ref: figure-general-flow1187036 +Ref: figure-process-flow1187635 +Ref: Basic High Level-Footnote-11190864 +Node: Basic Data Typing1191049 +Node: Glossary1194377 +Node: Copying1226306 +Node: GNU Free Documentation License1263862 +Node: Index1288998 End Tag Table diff --git a/doc/gawk.texi b/doc/gawk.texi index 7136a7de..c1fb6f10 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 @@ -8929,6 +8930,7 @@ 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 @@ -10435,6 +10437,63 @@ 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 @@ -10463,6 +10522,12 @@ 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 @@ -35689,6 +35754,10 @@ 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 @@ -36568,6 +36637,10 @@ 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 1e3a7c83..21f579d8 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 @@ -8529,6 +8530,7 @@ 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 @@ -9931,6 +9933,63 @@ 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 @@ -9959,6 +10018,12 @@ 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 @@ -34780,6 +34845,10 @@ 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 @@ -35659,6 +35728,10 @@ 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 ecbfaf0d..d047ae0a 100644 --- a/test/ChangeLog +++ b/test/ChangeLog @@ -3,6 +3,16 @@ * 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 4f78ddb4..38b0d00b 100644 --- a/test/Makefile.am +++ b/test/Makefile.am @@ -597,6 +597,10 @@ EXTRA_DIST = \ nondec.ok \ nondec2.awk \ nondec2.ok \ + nonfatal1.awk \ + nonfatal1.ok \ + nonfatal2.awk \ + nonfatal2.ok \ nonl.awk \ nonl.ok \ noparms.awk \ @@ -1044,6 +1048,7 @@ 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 30c77b97..9b235e46 100644 --- a/test/Makefile.in +++ b/test/Makefile.in @@ -854,6 +854,10 @@ EXTRA_DIST = \ nondec.ok \ nondec2.awk \ nondec2.ok \ + nonfatal1.awk \ + nonfatal1.ok \ + nonfatal2.awk \ + nonfatal2.ok \ nonl.awk \ nonl.ok \ noparms.awk \ @@ -1300,6 +1304,7 @@ 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 \ @@ -3628,6 +3633,16 @@ 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: $$? >>_$@ + @-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@ + patsplit: @echo $@ @AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@ diff --git a/test/Maketests b/test/Maketests index f3639b0f..9e19a2d5 100644 --- a/test/Maketests +++ b/test/Maketests @@ -1147,6 +1147,16 @@ nondec: @AWKPATH="$(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 |