/* * Copyright (c) 1980 Regents of the University of California. * All rights reserved. * * %sccs.include.redist.c% */ #ifndef lint static char sccsid[] = "@(#)vars.c 5.6 (Berkeley) 06/01/90"; #endif /* not lint */ #include "rcv.h" /* * Mail -- a mail program * * Variable handling stuff. */ /* * Assign a value to a variable. */ assign(name, value) char name[], value[]; { register struct var *vp; register int h; h = hash(name); vp = lookup(name); if (vp == NOVAR) { vp = (struct var *) 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! */ vfree(cp) char *cp; { if (*cp) free(cp); } /* * Copy a variable value into permanent (ie, not collected after each * command) space. Do not bother to alloc space for "" */ char * vcopy(str) char str[]; { char *new; unsigned len; if (*str == '\0') return ""; len = strlen(str) + 1; if ((new = malloc(len)) == NULL) panic("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(name) char name[]; { register struct var *vp; if ((vp = lookup(name)) == NOVAR) return(getenv(name)); return(vp->v_value); } /* * Locate a variable and return its variable * node. */ struct var * lookup(name) register char name[]; { register struct var *vp; for (vp = variables[hash(name)]; vp != NOVAR; vp = vp->v_link) if (*vp->v_name == *name && equal(vp->v_name, name)) return(vp); return(NOVAR); } /* * Locate a group name and return it. */ struct grouphead * findgroup(name) register char name[]; { register struct grouphead *gh; for (gh = groups[hash(name)]; gh != NOGRP; gh = gh->g_link) if (*gh->g_name == *name && equal(gh->g_name, name)) return(gh); return(NOGRP); } /* * Print a group out on stdout */ printgroup(name) char name[]; { register struct grouphead *gh; register struct group *gp; if ((gh = findgroup(name)) == NOGRP) { printf("\"%s\": not a group\n", name); return; } printf("%s\t", gh->g_name); for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link) printf(" %s", gp->ge_name); putchar('\n'); } /* * Hash the passed string and return an index into * the variable or group hash table. */ hash(name) register char *name; { register h = 0; while (*name) { h <<= 2; h += *name++; } if (h < 0 && (h = -h) < 0) h = 0; return (h % HSHSIZE); }