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Diffstat (limited to 'usr/dash/alias.c')
| -rw-r--r-- | usr/dash/alias.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/usr/dash/alias.c b/usr/dash/alias.c new file mode 100644 index 0000000..daeacbb --- /dev/null +++ b/usr/dash/alias.c @@ -0,0 +1,227 @@ +/*- + * Copyright (c) 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1997-2005 + * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <stdlib.h> +#include "shell.h" +#include "input.h" +#include "output.h" +#include "error.h" +#include "memalloc.h" +#include "mystring.h" +#include "alias.h" +#include "options.h" /* XXX for argptr (should remove?) */ + +#define ATABSIZE 39 + +struct alias *atab[ATABSIZE]; + +STATIC void setalias(const char *, const char *); +STATIC struct alias *freealias(struct alias *); +STATIC struct alias **__lookupalias(const char *); + +STATIC +void +setalias(const char *name, const char *val) +{ + struct alias *ap, **app; + + app = __lookupalias(name); + ap = *app; + INTOFF; + if (ap) { + if (!(ap->flag & ALIASINUSE)) { + ckfree(ap->val); + } + ap->val = savestr(val); + ap->flag &= ~ALIASDEAD; + } else { + /* not found */ + ap = ckmalloc(sizeof (struct alias)); + ap->name = savestr(name); + ap->val = savestr(val); + ap->flag = 0; + ap->next = 0; + *app = ap; + } + INTON; +} + +int +unalias(const char *name) +{ + struct alias **app; + + app = __lookupalias(name); + + if (*app) { + INTOFF; + *app = freealias(*app); + INTON; + return (0); + } + + return (1); +} + +void +rmaliases(void) +{ + struct alias *ap, **app; + int i; + + INTOFF; + for (i = 0; i < ATABSIZE; i++) { + app = &atab[i]; + for (ap = *app; ap; ap = *app) { + *app = freealias(*app); + if (ap == *app) { + app = &ap->next; + } + } + } + INTON; +} + +struct alias * +lookupalias(const char *name, int check) +{ + struct alias *ap = *__lookupalias(name); + + if (check && ap && (ap->flag & ALIASINUSE)) + return (NULL); + return (ap); +} + +/* + * TODO - sort output + */ +int +aliascmd(int argc, char **argv) +{ + char *n, *v; + int ret = 0; + struct alias *ap; + + if (argc == 1) { + int i; + + for (i = 0; i < ATABSIZE; i++) + for (ap = atab[i]; ap; ap = ap->next) { + printalias(ap); + } + return (0); + } + while ((n = *++argv) != NULL) { + if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */ + if ((ap = *__lookupalias(n)) == NULL) { + outfmt(out2, "%s: %s not found\n", "alias", n); + ret = 1; + } else + printalias(ap); + } else { + *v++ = '\0'; + setalias(n, v); + } + } + + return (ret); +} + +int +unaliascmd(int argc, char **argv) +{ + int i; + + while ((i = nextopt("a")) != '\0') { + if (i == 'a') { + rmaliases(); + return (0); + } + } + for (i = 0; *argptr; argptr++) { + if (unalias(*argptr)) { + outfmt(out2, "%s: %s not found\n", "unalias", *argptr); + i = 1; + } + } + + return (i); +} + +STATIC struct alias * +freealias(struct alias *ap) { + struct alias *next; + + if (ap->flag & ALIASINUSE) { + ap->flag |= ALIASDEAD; + return ap; + } + + next = ap->next; + ckfree(ap->name); + ckfree(ap->val); + ckfree(ap); + return next; +} + +void +printalias(const struct alias *ap) { + out1fmt("%s=%s\n", ap->name, single_quote(ap->val)); +} + +STATIC struct alias ** +__lookupalias(const char *name) { + unsigned int hashval; + struct alias **app; + const char *p; + unsigned int ch; + + p = name; + + ch = (unsigned char)*p; + hashval = ch << 4; + while (ch) { + hashval += ch; + ch = (unsigned char)*++p; + } + app = &atab[hashval % ATABSIZE]; + + for (; *app; app = &(*app)->next) { + if (equal(name, (*app)->name)) { + break; + } + } + + return app; +} |