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1.1 ! deraadt 1: /* $NetBSD: parser5.c,v 1.3 1995/09/28 10:34:35 tls Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1983, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * This code is derived from software contributed to Berkeley by
! 8: * Edward Wang at The University of California, Berkeley.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed by the University of
! 21: * California, Berkeley and its contributors.
! 22: * 4. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: */
! 38:
! 39: #ifndef lint
! 40: #if 0
! 41: static char sccsid[] = "@(#)parser5.c 8.1 (Berkeley) 6/6/93";
! 42: #else
! 43: static char rcsid[] = "$NetBSD: parser5.c,v 1.3 1995/09/28 10:34:35 tls Exp $";
! 44: #endif
! 45: #endif /* not lint */
! 46:
! 47: #include "parser.h"
! 48: #include "var.h"
! 49:
! 50: /*
! 51: * unary $ $? + - ! ~
! 52: */
! 53: p_expr11(v, flag)
! 54: register struct value *v;
! 55: char flag;
! 56: {
! 57: int op;
! 58: char *opname;
! 59:
! 60: switch (token) {
! 61: case T_DOLLAR:
! 62: opname = "$";
! 63: break;
! 64: case T_DQ:
! 65: opname = "$?";
! 66: break;
! 67: case T_PLUS:
! 68: opname = "unary +";
! 69: break;
! 70: case T_MINUS:
! 71: opname = "unary -";
! 72: break;
! 73: case T_NOT:
! 74: opname = "!";
! 75: break;
! 76: case T_COMP:
! 77: opname = "~";
! 78: break;
! 79: default:
! 80: return p_expr12(v, flag);
! 81: }
! 82: op = token;
! 83: (void) s_gettok();
! 84: if (p_expr11(v, flag) < 0)
! 85: return -1;
! 86: switch (v->v_type) {
! 87: case V_NUM:
! 88: break;
! 89: case V_STR:
! 90: switch (op) {
! 91: case T_MINUS:
! 92: case T_NOT:
! 93: case T_COMP:
! 94: p_error("%s: Numeric operand required.", opname);
! 95: str_free(v->v_str);
! 96: v->v_type = V_ERR;
! 97: return 0;
! 98: }
! 99: break;
! 100: case V_ERR:
! 101: return 0;
! 102: }
! 103: switch (op) {
! 104: case T_DOLLAR:
! 105: case T_DQ:
! 106: if (v->v_type == V_NUM) {
! 107: int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
! 108: v->v_num > 0 && v->v_num <= cx.x_narg;
! 109: if (op == T_DQ)
! 110: v->v_num = tmp;
! 111: else if (tmp)
! 112: *v = cx.x_arg[v->v_num - 1];
! 113: else {
! 114: p_error("%d: No such argument.", v->v_num);
! 115: v->v_type = V_ERR;
! 116: }
! 117: } else {
! 118: char *name = v->v_str;
! 119: struct var *r = var_lookup(name);
! 120: if (op == T_DQ) {
! 121: v->v_type = V_NUM;
! 122: v->v_num = r != 0;
! 123: } else if (r != 0)
! 124: *v = r->r_val;
! 125: else {
! 126: p_error("%s: Undefined variable.", name);
! 127: v->v_type = V_ERR;
! 128: }
! 129: str_free(name);
! 130: }
! 131: if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
! 132: p_memerror();
! 133: return -1;
! 134: }
! 135: break;
! 136: case T_MINUS:
! 137: v->v_num = - v->v_num;
! 138: break;
! 139: case T_NOT:
! 140: v->v_num = ! v->v_num;
! 141: break;
! 142: case T_COMP:
! 143: v->v_num = ~ v->v_num;
! 144: break;
! 145: }
! 146: return 0;
! 147: }
! 148:
! 149: /*
! 150: * string, number, ( expr )
! 151: * Plus function calls.
! 152: *
! 153: * Always return v_type == V_ERR when flag == 0.
! 154: */
! 155: p_expr12(v, flag)
! 156: register struct value *v;
! 157: char flag;
! 158: {
! 159: v->v_type = V_ERR;
! 160: switch (token) {
! 161: case T_NUM:
! 162: if (flag) {
! 163: v->v_type = V_NUM;
! 164: v->v_num = token_num;
! 165: }
! 166: (void) s_gettok();
! 167: break;
! 168: case T_STR:
! 169: if (flag) {
! 170: v->v_type = V_STR;
! 171: v->v_str = token_str;
! 172: } else
! 173: str_free(token_str);
! 174: (void) s_gettok();
! 175: break;
! 176: case T_LP:
! 177: (void) s_gettok();
! 178: if (p_expr(v, flag) < 0) {
! 179: p_synerror();
! 180: return -1;
! 181: }
! 182: if (token != T_RP) {
! 183: p_synerror();
! 184: val_free(*v);
! 185: return -1;
! 186: }
! 187: (void) s_gettok();
! 188: break;
! 189: default:
! 190: return -1;
! 191: }
! 192: while (token == T_LP) {
! 193: char *cmd;
! 194:
! 195: if (p_convstr(v) < 0)
! 196: return -1;
! 197: cmd = v->v_type == V_STR ? v->v_str : 0;
! 198: if (p_function(cmd, v, flag) < 0) {
! 199: if (cmd)
! 200: str_free(cmd);
! 201: return -1;
! 202: }
! 203: if (cmd)
! 204: str_free(cmd);
! 205: }
! 206: return 0;
! 207: }