diff options
Diffstat (limited to 'usr.bin/window/var.c')
| -rw-r--r-- | usr.bin/window/var.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/usr.bin/window/var.c b/usr.bin/window/var.c new file mode 100644 index 0000000..638dc95 --- /dev/null +++ b/usr.bin/window/var.c @@ -0,0 +1,157 @@ +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Edward Wang at The University of California, Berkeley. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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 +static char sccsid[] = "@(#)var.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +#include "value.h" +#include "var.h" +#include "string.h" + +char *malloc(); + +struct var * +var_set1(head, name, v) +struct var **head; +char *name; +struct value *v; +{ + register struct var **p; + register struct var *r; + struct value val; + + /* do this first, easier to recover */ + val = *v; + if (val.v_type == V_STR && val.v_str != 0 && + (val.v_str = str_cpy(val.v_str)) == 0) + return 0; + if (*(p = var_lookup1(head, name)) == 0) { + r = (struct var *) malloc(sizeof (struct var)); + if (r == 0) { + val_free(val); + return 0; + } + if ((r->r_name = str_cpy(name)) == 0) { + val_free(val); + free((char *) r); + return 0; + } + r->r_left = r->r_right = 0; + *p = r; + } else { + r = *p; + val_free(r->r_val); + } + r->r_val = val; + return r; +} + +struct var * +var_setstr1(head, name, str) +struct var **head; +char *name; +char *str; +{ + struct value v; + + v.v_type = V_STR; + v.v_str = str; + return var_set1(head, name, &v); +} + +struct var * +var_setnum1(head, name, num) +struct var **head; +char *name; +int num; +{ + struct value v; + + v.v_type = V_NUM; + v.v_num = num; + return var_set1(head, name, &v); +} + +var_unset1(head, name) +struct var **head; +char *name; +{ + register struct var **p; + register struct var *r; + + if (*(p = var_lookup1(head, name)) == 0) + return -1; + r = *p; + *p = r->r_left; + while (*p != 0) + p = &(*p)->r_right; + *p = r->r_right; + val_free(r->r_val); + str_free(r->r_name); + free((char *) r); + return 0; +} + +struct var ** +var_lookup1(p, name) +register struct var **p; +register char *name; +{ + register cmp; + + while (*p != 0) { + if ((cmp = strcmp(name, (*p)->r_name)) < 0) + p = &(*p)->r_left; + else if (cmp > 0) + p = &(*p)->r_right; + else + break; + } + return p; +} + +var_walk1(r, func, a) +register struct var *r; +int (*func)(); +{ + if (r == 0) + return 0; + if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0 + || var_walk1(r->r_right, func, a) < 0) + return -1; + return 0; +} |
