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1.1 ! root 1: /* ! 2: * Copyright (c) 1983 Regents of the University of California. ! 3: * All rights reserved. ! 4: * ! 5: * Redistribution and use in source and binary forms are permitted ! 6: * provided that the above copyright notice and this paragraph are ! 7: * duplicated in all such forms and that any documentation, ! 8: * advertising materials, and other materials related to such ! 9: * distribution and use acknowledge that the software was developed ! 10: * by the University of California, Berkeley. The name of the ! 11: * University may not be used to endorse or promote products derived ! 12: * from this software without specific prior written permission. ! 13: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR ! 14: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED ! 15: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. ! 16: */ ! 17: ! 18: #ifndef lint ! 19: static char sccsid[] = "@(#)parser1.c 3.20 (Berkeley) 6/29/88"; ! 20: #endif /* not lint */ ! 21: ! 22: #include "parser.h" ! 23: ! 24: p_start() ! 25: { ! 26: char flag = 1; ! 27: ! 28: (void) s_gettok(); ! 29: for (;;) { ! 30: p_statementlist(flag); ! 31: if (token == T_EOF || p_abort()) ! 32: break; ! 33: flag = 0; ! 34: p_synerror(); ! 35: while (token != T_EOL && token != T_EOF) { ! 36: if (token == T_STR) ! 37: str_free(token_str); ! 38: (void) s_gettok(); ! 39: } ! 40: if (token == T_EOL) ! 41: (void) s_gettok(); ! 42: p_clearerr(); ! 43: } ! 44: } ! 45: ! 46: p_statementlist(flag) ! 47: char flag; ! 48: { ! 49: for (; p_statement(flag) >= 0; p_clearerr()) ! 50: ; ! 51: } ! 52: ! 53: p_statement(flag) ! 54: char flag; ! 55: { ! 56: switch (token) { ! 57: case T_EOL: ! 58: (void) s_gettok(); ! 59: return 0; ! 60: case T_IF: ! 61: return p_if(flag); ! 62: default: ! 63: return p_expression(flag); ! 64: } ! 65: } ! 66: ! 67: p_if(flag) ! 68: char flag; ! 69: { ! 70: struct value t; ! 71: char true = 0; ! 72: ! 73: top: ! 74: (void) s_gettok(); ! 75: ! 76: if (p_expr(&t, flag) < 0) { ! 77: p_synerror(); ! 78: return -1; ! 79: } ! 80: switch (t.v_type) { ! 81: case V_NUM: ! 82: true = !true && t.v_num != 0; ! 83: break; ! 84: case V_STR: ! 85: p_error("if: Numeric value required."); ! 86: str_free(t.v_str); ! 87: case V_ERR: ! 88: flag = 0; ! 89: break; ! 90: } ! 91: ! 92: if (token != T_THEN) { ! 93: p_synerror(); ! 94: return -1; ! 95: } ! 96: ! 97: (void) s_gettok(); ! 98: p_statementlist(flag && true); ! 99: if (p_erred()) ! 100: return -1; ! 101: ! 102: if (token == T_ELSIF) ! 103: goto top; ! 104: ! 105: if (token == T_ELSE) { ! 106: (void) s_gettok(); ! 107: p_statementlist(flag && !true); ! 108: if (p_erred()) ! 109: return -1; ! 110: } ! 111: ! 112: if (token == T_ENDIF) { ! 113: (void) s_gettok(); ! 114: return 0; ! 115: } ! 116: ! 117: p_synerror(); ! 118: return -1; ! 119: } ! 120: ! 121: p_expression(flag) ! 122: char flag; ! 123: { ! 124: struct value t; ! 125: char *cmd; ! 126: int p_function(), p_assign(); ! 127: ! 128: switch (token) { ! 129: case T_NUM: ! 130: t.v_type = V_NUM; ! 131: t.v_num = token_num; ! 132: (void) s_gettok(); ! 133: break; ! 134: case T_STR: ! 135: t.v_type = V_STR; ! 136: t.v_str = token_str; ! 137: (void) s_gettok(); ! 138: break; ! 139: default: ! 140: if (p_expr(&t, flag) < 0) ! 141: return -1; ! 142: if (token == T_EOF) { ! 143: val_free(t); ! 144: return 0; ! 145: } ! 146: } ! 147: if (token != T_ASSIGN && p_convstr(&t) < 0) ! 148: return -1; ! 149: cmd = t.v_type == V_STR ? t.v_str : 0; ! 150: if ((*(token == T_ASSIGN ? p_assign : p_function))(cmd, &t, flag) < 0) { ! 151: if (cmd) ! 152: str_free(cmd); ! 153: return -1; ! 154: } ! 155: if (cmd) ! 156: str_free(cmd); ! 157: val_free(t); ! 158: if (token == T_EOL) ! 159: (void) s_gettok(); ! 160: else if (token != T_EOF) { ! 161: p_synerror(); ! 162: return -1; ! 163: } ! 164: return 0; ! 165: } ! 166: ! 167: p_convstr(v) ! 168: register struct value *v; ! 169: { ! 170: if (v->v_type != V_NUM) ! 171: return 0; ! 172: if ((v->v_str = str_itoa(v->v_num)) == 0) { ! 173: p_memerror(); ! 174: v->v_type = V_ERR; ! 175: return -1; ! 176: } ! 177: v->v_type = V_STR; ! 178: return 0; ! 179: } ! 180: ! 181: p_synerror() ! 182: { ! 183: if (!cx.x_synerred) { ! 184: cx.x_synerred = cx.x_erred = 1; ! 185: error("Syntax error."); ! 186: } ! 187: } ! 188: ! 189: /*VARARGS1*/ ! 190: p_error(msg, a, b, c) ! 191: char *msg; ! 192: { ! 193: if (!cx.x_erred) { ! 194: cx.x_erred = 1; ! 195: error(msg, a, b, c); ! 196: } ! 197: } ! 198: ! 199: p_memerror() ! 200: { ! 201: cx.x_erred = cx.x_abort = 1; ! 202: error("Out of memory."); ! 203: }
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