source: vendor/gawk/3.1.5/vms/vms_args.c

Last change on this file was 3076, checked in by bird, 18 years ago

gawk 3.1.5
File size: 15.3 KB
Line 
1/* vms_args.c -- command line parsing, to emulate shell i/o redirection.
2 [ Escape sequence parsing now suppressed. ]
3
4 Copyright (C) 1991-1996, 1997 the Free Software Foundation, Inc.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19
20/*
21 * [.vms]vms_arg_fixup - emulate shell's command line processing: handle
22 * stdio redirection, backslash escape sequences, and file wildcard
23 * expansion. Should be called immediately upon image startup.
24 *
25 * Pat Rankin, Nov'89
26 * rankin@pactechdata.com
27 *
28 * <ifile - open 'ifile' (readonly) as 'stdin'
29 * >nfile - create 'nfile' as 'stdout' (stream-lf format)
30 * >>ofile - append to 'ofile' for 'stdout'; create it if necessary
31 * >&efile - point 'stderr' (SYS$ERROR) at 'efile', but don't open
32 * >$vfile - create 'vfile' as 'stdout', using rms attributes
33 * appropriate for a standard text file (variable length
34 * records with implied carriage control)
35 * >+vfile - create 'vfile' as 'stdout' in binary mode (using
36 * variable length records with implied carriage control)
37 * 2>&1 - special case: direct error messages into output file
38 * 1>&2 - special case: direct output data to error destination
39 * <<sentinal - error; reading stdin until 'sentinal' not supported
40 * <-, >- - error: stdin/stdout closure not implemented
41 * | anything - error; pipes not implemented
42 * & <end-of-line> - error; background execution not implemented
43 *
44 * any\Xany - convert 'X' as appropriate; \000 will not work as
45 * intended since subsequent processing will misinterpret
46 *
47 * any*any - perform wildcard directory lookup to find file(s)
48 * any%any - " " ('%' is vms wildcard for '?' [ie, /./])
49 * any?any - treat like 'any%any' unless no files match
50 * *, %, ? - if no file(s) match, leave original value in arg list
51 *
52 *
53 * Notes: a redirection operator can have optional white space between it
54 * and its filename; the operator itself *must* be preceded by white
55 * space so that it starts a separate argument. '<' is ambiguous
56 * since "<dir>file" is a valid VMS file specification; leading '<' is
57 * assumed to be stdin--use "\<dir>file" to override. '>$' is local
58 * kludge to force stdout to be created with text file RMS attributes
59 * instead of stream format; file sharing is disabled for stdout
60 * regardless. Multiple instances of stdin or stdout or stderr are
61 * treated as fatal errors rather than using the first or last. If a
62 * wildcard file specification is detected, it is expanded into a list
63 * of filenames which match; if there are no matches, the original
64 * file-spec is left in the argument list rather than having it expand
65 * into thin air. No attempt is made to identify and make $(var)
66 * environment substitutions--must draw the line somewhere!
67 *
68 * Oct'91, gawk 2.13.3
69 * Open '<' with full sharing allowed, so that we can read batch logs
70 * and other open files. Create record-format output ('>$') with read
71 * sharing permited, so that others can read our output file to check
72 * progess. For stream output ('>' or '>>'), sharing is disallowed
73 * (for performance reasons).
74 *
75 * Sep'94, gawk 2.15.6 [pr]
76 * Add '>+' to force binary mode output, to enable better control
77 * for the user when the output destination is a mailbox or socket.
78 * (ORS = "\r\n" for tcp/ip.) Contributed by Per Steinar Iversen.
79 */
80
81#include "awk.h" /* really "../awk.h" */
82#include "vms.h"
83#include <lnmdef.h>
84
85 void v_add_arg(int, const char *);
86static char *skipblanks(const char *);
87static void vms_expand_wildcards(const char *);
88static U_Long vms_define(const char *, const char *);
89static char *t_strstr(const char *, const char *);
90#define strstr t_strstr /* strstr() missing from vaxcrtl for V4.x */
91
92static int v_argc, v_argz = 0;
93static char **v_argv;
94
95/* vms_arg_fixup() - scan argv[] for i/o redirection and wildcards and also */
96/* rebuild it with those removed or expanded, respectively */
97void
98vms_arg_fixup( int *pargc, char ***pargv )
99{
100 const char *f_in, *f_out, *f_err,
101 *out_mode, *rms_rfm, *rms_shr, *rms_mrs;
102 char **argv = *pargv;
103 int i, argc = *pargc;
104 int err_to_out_redirect = 0, out_to_err_redirect = 0;
105
106#ifdef CHECK_DECSHELL /* don't define this if linking with DECC$SHR */
107 if (shell$is_shell())
108 return; /* don't do anything if we're running DEC/Shell */
109#endif
110#ifndef NO_DCL_CMD
111 for (i = 1; i < argc ; i++) /* check for dash or other non-VMS args */
112 if (strchr("->\\|", *argv[i])) break; /* found => (i < argc) */
113 if (i >= argc && (v_argc = vms_gawk()) > 0) { /* vms_gawk => dcl_parse */
114 /* if we successfully parsed the command, replace original argv[] */
115 argc = v_argc, argv = v_argv;
116 v_argz = v_argc = 0, v_argv = NULL;
117 }
118#endif
119 v_add_arg(v_argc = 0, argv[0]); /* store arg #0 (image name) */
120
121 f_in = f_out = f_err = NULL; /* stdio setup (no filenames yet) */
122 out_mode = "w"; /* default access for stdout */
123 rms_rfm = "rfm=stmlf"; /* stream_LF format */
124 rms_shr = "shr=nil"; /* no sharing (for '>' output file) */
125 rms_mrs = "mrs=0"; /* no maximum record size */
126
127 for (i = 1; i < argc; i++) {
128 char *p, *fn;
129 int is_arg;
130
131 is_arg = 0; /* current arg does not begin with dash */
132 p = argv[i]; /* current arg */
133 switch (*p) {
134 case '<': /* stdin */
135 /*[should try to determine whether this is really a directory
136 spec using <>; for now, force user to quote them with '\<']*/
137 if ( f_in ) {
138 fatal("multiple specification of '<' for stdin");
139 } else if (*++p == '<') { /* '<<' is not supported */
140 fatal("'<<' not available for stdin");
141 } else {
142 p = skipblanks(p);
143 fn = (*p ? p : argv[++i]); /* use next arg if necessary */
144 if (i >= argc || *fn == '-')
145 fatal("invalid i/o redirection, null filespec after '<'");
146 else
147 f_in = fn; /* save filename for stdin */
148 }
149 break;
150 case '>': { /* stdout or stderr */
151 /*[vms-specific kludge '>$' added to force stdout to be created
152 as record-oriented text file instead of in stream-lf format]*/
153 int is_out = 1; /* assume stdout */
154 if (*++p == '>') /* '>>' => append */
155 out_mode = "a", p++;
156 else if (*p == '&') /* '>&' => stderr */
157 is_out = 0, p++;
158 else if (*p == '$') /* '>$' => kludge for record format */
159 rms_rfm = "rfm=var", rms_shr = "shr=get,upi",
160 rms_mrs = "mrs=32767", p++;
161 else if (*p == '+') /* '>+' => kludge for binary output */
162 out_mode = "wb", rms_rfm = "rfm=var",
163 rms_mrs = "mrs=32767", p++;
164 else /* '>' => create */
165 {} /* use default values initialized prior to loop */
166 p = skipblanks(p);
167 fn = (*p ? p : argv[++i]); /* use next arg if necessary */
168 if (i >= argc || *fn == '-') {
169 fatal("invalid i/o redirection, null filespec after '>'");
170 } else if (is_out) {
171 if (out_to_err_redirect)
172 fatal("conflicting specifications for stdout");
173 else if (f_out)
174 fatal("multiple specification of '>' for stdout");
175 else
176 f_out = fn; /* save filename for stdout */
177 } else {
178 if (err_to_out_redirect)
179 fatal("conflicting specifications for stderr");
180 else if (f_err)
181 fatal("multiple specification of '>&' for stderr");
182 else
183 f_err = fn; /* save filename for stderr */
184 }
185 } break;
186 case '2': /* check for ``2>&1'' special case'' */
187 if (strcmp(p, "2>&1") != 0)
188 goto ordinary_arg;
189 else if (f_err || out_to_err_redirect)
190 fatal("conflicting specifications for stderr");
191 else {
192 err_to_out_redirect = 1;
193 f_err = "SYS$OUTPUT:";
194 } break;
195 case '1': /* check for ``1>&2'' special case'' */
196 if (strcmp(p, "1>&2") != 0)
197 goto ordinary_arg;
198 else if (f_out || err_to_out_redirect)
199 fatal("conflicting specifications for stdout");
200 else {
201 out_to_err_redirect = 1;
202 /* f_out = "SYS$ERROR:"; */
203 } break;
204 case '|': /* pipe */
205 /* command pipelines are not supported */
206 fatal("command pipes not available ('|' encountered)");
207 break;
208 case '&': /* background */
209 /*[we could probably spawn or fork ourself--maybe someday]*/
210 if (*(p+1) == '\0' && i == argc - 1) {
211 fatal("background tasks not available ('&' encountered)");
212 break;
213 } else { /* fall through */
214 ; /*NOBREAK*/
215 }
216 case '-': /* argument */
217 is_arg = 1; /*(=> skip wildcard check)*/
218 default: /* other (filespec assumed) */
219ordinary_arg:
220 /* process escape sequences or expand wildcards */
221 v_add_arg(++v_argc, p); /* include this arg */
222 p = strchr(p, '\\'); /* look for backslash */
223 if (p != NULL) { /* does it have escape sequence(s)? */
224#if 0 /* disable escape parsing; it's now done elsewhere within gawk */
225 register int c;
226 char *q = v_argv[v_argc] + (p - argv[i]);
227 do {
228 c = *p++;
229 if (c == '\\')
230 c = parse_escape(&p);
231 *q++ = (c >= 0 ? (char)c : '\\');
232 } while (*p != '\0');
233 *q = '\0';
234#endif /*0*/
235 } else if (!is_arg && strchr(v_argv[v_argc], '=') == NULL) {
236 vms_expand_wildcards(v_argv[v_argc]);
237 }
238 break;
239 } /* end switch */
240 } /* loop */
241
242 /*
243 * Now process any/all I/O options encountered above.
244 */
245
246 /* must do stderr first, or vaxcrtl init might not see it */
247 /*[ catch 22: we'll also redirect errors encountered doing <in or >out ]*/
248 if (f_err) { /* define logical name but don't open file */
249 int len = strlen(f_err);
250 if (len >= (sizeof "SYS$OUTPUT" - sizeof "")
251 && strncasecmp(f_err, "SYS$OUTPUT:", len) == 0)
252 err_to_out_redirect = 1;
253 else
254 (void) vms_define("SYS$ERROR", f_err);
255 }
256 /* do stdin before stdout, so if we bomb we won't make empty output file */
257 if (f_in) { /* [re]open file and define logical name */
258 if (freopen(f_in, "r", stdin,
259 "ctx=rec", "shr=get,put,del,upd",
260 "mrs=32767", "mbc=32", "mbf=2"))
261 (void) vms_define("SYS$INPUT", f_in);
262 else
263 fatal("<%s (%s)", f_in, strerror(errno));
264 }
265 if (f_out) {
266 if (freopen(f_out, out_mode, stdout,
267 rms_rfm, rms_shr, rms_mrs,
268 "rat=cr", "mbc=32", "mbf=2"))
269 (void) vms_define("SYS$OUTPUT", f_out);
270 else
271 fatal(">%s%s (%s)", (*out_mode == 'a' ? ">" : ""),
272 f_out, strerror(errno));
273 }
274 if (err_to_out_redirect) { /* special case for ``2>&1'' construct */
275 (void) dup2(1, 2); /* make file 2 (stderr) share file 1 (stdout) */
276 (void) vms_define("SYS$ERROR", "SYS$OUTPUT:");
277 } else if (out_to_err_redirect) { /* ``1>&2'' */
278 (void) dup2(2, 1); /* make file 1 (stdout) share file 2 (stderr) */
279 (void) vms_define("SYS$OUTPUT", "SYS$ERROR:");
280 }
281
282#ifndef NO_DCL_CMD
283 /* if we replaced argv[] with our own, we can release it now */
284 if (argv != *pargv)
285 free((void *)argv), argv = NULL;
286#endif
287 *pargc = ++v_argc; /* increment to account for argv[0] */
288 *pargv = v_argv;
289 return;
290}
291
292/* vms_expand_wildcards() - check a string for wildcard punctuation; */
293/* if it has any, attempt a directory lookup */
294/* and store resulting name(s) in argv array */
295static void
296vms_expand_wildcards( const char *prospective_filespec )
297{
298 char *p, spec_buf[255+1], res_buf[255+1];
299 Dsc spec, result;
300 void *context;
301 register int len = strlen(prospective_filespec);
302
303 if (len >= sizeof spec_buf)
304 return; /* can't be valid--or at least we can't handle it */
305 strcpy(spec_buf, prospective_filespec); /* copy the arg */
306 p = strchr(spec_buf, '?');
307 if (p != NULL) /* change '?' single-char wildcard to '%' */
308 do *p++ = '%', p = strchr(p, '?');
309 while (p != NULL);
310 else if (strchr(spec_buf, '*') == strchr(spec_buf, '%') /* => both NULL */
311 && strstr(spec_buf, "...") == NULL)
312 return; /* no wildcards present; don't attempt file lookup */
313 spec.len = len, spec.adr = spec_buf;
314 result.len = sizeof res_buf - 1, result.adr = res_buf;
315
316 /* The filespec is already in v_argv[v_argc]; if we fail to match anything,
317 we'll just leave it there (unlike most shells, where it would evaporate).
318 */
319 len = -1; /* overload 'len' with flag value */
320 context = NULL; /* init */
321 while (vmswork(lib$find_file(&spec, &result, &context))) {
322 for (len = sizeof(res_buf)-1; len > 0 && res_buf[len-1] == ' '; len--) ;
323 res_buf[len] = '\0'; /* terminate after discarding trailing blanks */
324 v_add_arg(v_argc++, strdup(res_buf)); /* store result */
325 }
326 (void)lib$find_file_end(&context);
327 if (len >= 0) /* (still -1 => never entered loop) */
328 --v_argc; /* undo final post-increment */
329 return;
330}
331
332/* v_add_arg() - store string pointer in v_argv[]; expand array if necessary */
333void
334v_add_arg( int idx, const char *val )
335{
336#ifdef DEBUG_VMS
337 fprintf(stderr, "v_add_arg: v_argv[%d] ", idx);
338#endif
339 if (idx + 1 >= v_argz) { /* 'v_argz' is the current size of v_argv[] */
340 int old_size = v_argz;
341
342 v_argz = idx + 10; /* increment by arbitrary amount */
343 if (old_size == 0)
344 v_argv = (char **)malloc((unsigned)(v_argz * sizeof(char **)));
345 else
346 v_argv = (char **)realloc((char *)v_argv,
347 (unsigned)(v_argz * sizeof(char **)));
348 if (v_argv == NULL) { /* error */
349 fatal("%s: %s: can't allocate memory (%s)", "vms_args",
350 "v_argv", strerror(errno));
351 } else {
352 while (old_size < v_argz) v_argv[old_size++] = NULL;
353 }
354 }
355 v_argv[idx] = (char *)val;
356#ifdef DEBUG_VMS
357 fprintf(stderr, "= \"%s\"\n", val);
358#endif
359}
360
361/* skipblanks() - return a pointer to the first non-blank in the string */
362static char *
363skipblanks( const char *ptr )
364{
365 if (ptr)
366 while (*ptr == ' ' || *ptr == '\t')
367 ptr++;
368 return (char *)ptr;
369}
370
371/* vms_define() - assign a value to a logical name [define/process/user_mode] */
372static U_Long
373vms_define( const char *log_name, const char *trans_val )
374{
375 Dsc log_dsc;
376 static Descrip(lnmtable,"LNM$PROCESS_TABLE");
377 static U_Long attr = LNM$M_CONFINE;
378 static Itm itemlist[] = { {0,LNM$_STRING,0,0}, {0,0} };
379 static unsigned char acmode = PSL$C_USER;
380 unsigned len = strlen(log_name);
381
382 /* avoid "define SYS$OUTPUT sys$output:" for redundant ">sys$output:" */
383 if (strncasecmp(log_name, trans_val, len) == 0
384 && (trans_val[len] == '\0' || trans_val[len] == ':'))
385 return 0;
386
387 log_dsc.adr = (char *)log_name;
388 log_dsc.len = len;
389 itemlist[0].buffer = (char *)trans_val;
390 itemlist[0].len = strlen(trans_val);
391 return sys$crelnm(&attr, &lnmtable, &log_dsc, &acmode, itemlist);
392}
393
394/* t_strstr -- strstr() substitute; search 'str' for 'sub' */
395/* [strstr() was not present in VAXCRTL prior to VMS V5.0] */
396static char *t_strstr ( const char *str, const char *sub )
397{
398 register const char *s0, *s1, *s2;
399
400 /* special case: empty substring */
401 if (!*sub) return (char *)str;
402
403 /* brute force method */
404 for (s0 = s1 = str; *s1; s1 = ++s0) {
405 s2 = sub;
406 while (*s1++ == *s2++)
407 if (!*s2) return (char *)s0; /* full match */
408 }
409 return (char *)0; /* not found */
410}
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