diff options
Diffstat (limited to 'usr.bin/mail/vars.c')
| -rw-r--r-- | usr.bin/mail/vars.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/usr.bin/mail/vars.c b/usr.bin/mail/vars.c new file mode 100644 index 0000000..dca0604 --- /dev/null +++ b/usr.bin/mail/vars.c @@ -0,0 +1,182 @@ +/* + * Copyright (c) 1980, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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. + * 4. 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. + */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)vars.c 8.1 (Berkeley) 6/6/93"; +#endif +#endif /* not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "rcv.h" +#include "extern.h" + +/* + * Mail -- a mail program + * + * Variable handling stuff. + */ + +/* + * Assign a value to a variable. + */ +void +assign(const char *name, const char *value) +{ + struct var *vp; + int h; + + h = hash(name); + vp = lookup(name); + if (vp == NULL) { + vp = calloc(sizeof(*vp), 1); + vp->v_name = vcopy(name); + vp->v_link = variables[h]; + variables[h] = vp; + } + else + vfree(vp->v_value); + vp->v_value = vcopy(value); +} + +/* + * Free up a variable string. We do not bother to allocate + * strings whose value is "" since they are expected to be frequent. + * Thus, we cannot free same! + */ +void +vfree(char *cp) +{ + if (*cp != '\0') + (void)free(cp); +} + +/* + * Copy a variable value into permanent (ie, not collected after each + * command) space. Do not bother to alloc space for "" + */ + +char * +vcopy(const char *str) +{ + char *new; + unsigned len; + + if (*str == '\0') + return (""); + len = strlen(str) + 1; + if ((new = malloc(len)) == NULL) + err(1, "Out of memory"); + bcopy(str, new, (int)len); + return (new); +} + +/* + * Get the value of a variable and return it. + * Look in the environment if its not available locally. + */ + +char * +value(const char *name) +{ + struct var *vp; + + if ((vp = lookup(name)) == NULL) + return (getenv(name)); + return (vp->v_value); +} + +/* + * Locate a variable and return its variable + * node. + */ + +struct var * +lookup(const char *name) +{ + struct var *vp; + + for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link) + if (*vp->v_name == *name && equal(vp->v_name, name)) + return (vp); + return (NULL); +} + +/* + * Locate a group name and return it. + */ + +struct grouphead * +findgroup(char name[]) +{ + struct grouphead *gh; + + for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link) + if (*gh->g_name == *name && equal(gh->g_name, name)) + return (gh); + return (NULL); +} + +/* + * Print a group out on stdout + */ +void +printgroup(char name[]) +{ + struct grouphead *gh; + struct group *gp; + + if ((gh = findgroup(name)) == NULL) { + printf("\"%s\": not a group\n", name); + return; + } + printf("%s\t", gh->g_name); + for (gp = gh->g_list; gp != NULL; gp = gp->ge_link) + printf(" %s", gp->ge_name); + printf("\n"); +} + +/* + * Hash the passed string and return an index into + * the variable or group hash table. + */ +int +hash(const char *name) +{ + int h = 0; + + while (*name != '\0') { + h <<= 2; + h += *name++; + } + if (h < 0 && (h = -h) < 0) + h = 0; + return (h % HSHSIZE); +} |
