mirror of
https://github.com/sheumann/hush.git
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Apply vodz's last_patch53.gz (bb_asprintf.c) and last_patch54.gz
(arith.c).
This commit is contained in:
Manuel Novoa III
parent
7829b8d067
commit
4d0884a1ea
141
libbb/arith.c
141
libbb/arith.c
@ -140,8 +140,7 @@ typedef char operator;
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#define TOK_REM tok_decl(10,2)
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/* For now all unary operators have the same precedence, and that's used to
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* identify them as unary operators
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*/
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* identify them as unary operators */
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#define UNARYPREC 14
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#define TOK_BNOT tok_decl(UNARYPREC,0)
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#define TOK_NOT tok_decl(UNARYPREC,1)
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@ -157,82 +156,68 @@ typedef char operator;
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/* "applying" a token means performing it on the top elements on the integer
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* stack. For a unary operator it will only change the top element, but a
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* binary operator will pop two arguments and push a result
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*/
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* binary operator will pop two arguments and push a result */
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static short arith_apply(operator op, long *numstack, long **numstackptr)
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{
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long numptr_val;
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long *NUMPTR_M1;
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/* There is no operator that can work without arguments */
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if (NUMPTR == numstack) {
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goto err;
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}
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if (NUMPTR == numstack) goto err; /* There is no operator that can work
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without arguments */
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NUMPTR_M1 = NUMPTR - 1;
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if (op == TOK_UMINUS) {
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if (op == TOK_UMINUS)
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*NUMPTR_M1 *= -1;
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} else if (op == TOK_NOT) {
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else if (op == TOK_NOT)
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*NUMPTR_M1 = !(*NUMPTR_M1);
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} else if (op == TOK_BNOT) {
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else if (op == TOK_BNOT)
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*NUMPTR_M1 = ~(*NUMPTR_M1);
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} else if (op != TOK_UPLUS) {
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else if (op != TOK_UPLUS) {
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/* Binary operators */
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/* ... and binary operators need two arguments */
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if (NUMPTR_M1 == numstack) {
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goto err;
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}
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/* ... and they pop one */
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numptr_val = *--NUMPTR;
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if (NUMPTR_M1 == numstack) goto err; /* ... and binary operators need two
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arguments */
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numptr_val = *--NUMPTR; /* ... and they pop one */
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NUMPTR_M1 = NUMPTR - 1;
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if (op == TOK_BOR) {
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if (op == TOK_BOR)
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*NUMPTR_M1 |= numptr_val;
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} else if (op == TOK_OR) {
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else if (op == TOK_OR)
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*NUMPTR_M1 = numptr_val || *NUMPTR_M1;
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} else if (op == TOK_BAND) {
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else if (op == TOK_BAND)
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*NUMPTR_M1 &= numptr_val;
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} else if (op == TOK_AND) {
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else if (op == TOK_AND)
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*NUMPTR_M1 = *NUMPTR_M1 && numptr_val;
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} else if (op == TOK_EQ) {
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else if (op == TOK_EQ)
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*NUMPTR_M1 = (*NUMPTR_M1 == numptr_val);
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} else if (op == TOK_NE) {
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else if (op == TOK_NE)
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*NUMPTR_M1 = (*NUMPTR_M1 != numptr_val);
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} else if (op == TOK_GE) {
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else if (op == TOK_GE)
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*NUMPTR_M1 = (*NUMPTR_M1 >= numptr_val);
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} else if (op == TOK_RSHIFT) {
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else if (op == TOK_RSHIFT)
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*NUMPTR_M1 >>= numptr_val;
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} else if (op == TOK_LSHIFT) {
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else if (op == TOK_LSHIFT)
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*NUMPTR_M1 <<= numptr_val;
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} else if (op == TOK_GT) {
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else if (op == TOK_GT)
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*NUMPTR_M1 = (*NUMPTR_M1 > numptr_val);
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} else if (op == TOK_LT) {
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else if (op == TOK_LT)
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*NUMPTR_M1 = (*NUMPTR_M1 < numptr_val);
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} else if (op == TOK_LE) {
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else if (op == TOK_LE)
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*NUMPTR_M1 = (*NUMPTR_M1 <= numptr_val);
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} else if (op == TOK_MUL) {
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else if (op == TOK_MUL)
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*NUMPTR_M1 *= numptr_val;
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} else if (op == TOK_ADD) {
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else if (op == TOK_ADD)
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*NUMPTR_M1 += numptr_val;
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} else if (op == TOK_SUB) {
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else if (op == TOK_SUB)
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*NUMPTR_M1 -= numptr_val;
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}
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/* zero divisor check */
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else if (numptr_val == 0) {
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else if(numptr_val==0) /* zero divisor check */
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return -2;
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} else if (op == TOK_DIV) {
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else if (op == TOK_DIV)
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*NUMPTR_M1 /= numptr_val;
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} else if (op == TOK_REM) {
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else if (op == TOK_REM)
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*NUMPTR_M1 %= numptr_val;
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}
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/* WARNING!!! WARNING!!! WARNING!!! */
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/* Any new operators should be added BEFORE the zero divisor check! */
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}
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return 0;
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err:
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return (-1);
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err: return(-1);
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}
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static const char endexpression[] = ")";
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@ -242,7 +227,7 @@ static const char op_char[] = "!<>=|&*/%~()+-";
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static const char op_token[] = {
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/* paired with equal */
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TOK_NE, TOK_LE, TOK_GE,
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/* paired with self -- note: ! is special-cased below */
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/* paired with self -- note: ! is special-cased below*/
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TOK_ERROR, TOK_LSHIFT, TOK_RSHIFT, TOK_EQ, TOK_OR, TOK_AND,
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/* singles */
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TOK_NOT, TOK_LT, TOK_GT, TOK_ERROR, TOK_BOR, TOK_BAND,
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@ -253,33 +238,34 @@ static const char op_token[] = {
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#define NUM_PAIR_EQUAL 3
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#define NUM_PAIR_SAME 6
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extern long arith(const char *expr, int *errcode)
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extern long arith (const char *expr, int *errcode)
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{
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register char arithval; /* Current character under analysis */
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operator lasttok, op;
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unsigned char prec;
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const char *p = endexpression;
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size_t datasizes = strlen(expr);
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size_t datasizes = strlen(expr) + 2;
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/* Stack of integers */
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/* The proof that there can be no more than strlen(startbuf)/2+1 integers
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* in any given correct or incorrect expression is left as an excersize to
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* the reader. */
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long *numstack = alloca(((datasizes + 1) / 2) * sizeof(long));
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long *numstackptr = numstack;
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long *numstack = alloca(((datasizes)/2)*sizeof(long)),
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*numstackptr = numstack;
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/* Stack of operator tokens */
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operator * stack = alloca((datasizes + 1) * sizeof(operator));
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operator * stackptr = stack;
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operator *stack = alloca((datasizes) * sizeof(operator)),
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*stackptr = stack;
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/* start off with a left paren */
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*stackptr++ = lasttok = TOK_LPAREN;
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*numstack = 0;
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*stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */
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loop:
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if ((arithval = *expr) == 0) {
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/* Null expression. */
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if (p == endexpression) {
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return (*errcode = 0);
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if (p == endexpression) { /* Null expression. */
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*errcode = 0;
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return *numstack;
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}
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/* This is only reached after all tokens have been extracted from the
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@ -292,7 +278,7 @@ extern long arith(const char *expr, int *errcode)
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goto loop; /* and let the loop process it. */
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}
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/* At this point, we're done with the expression. */
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if (numstackptr != numstack + 1) { /* ... but if there isn't, it's bad */
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if (numstackptr != numstack+1) {/* ... but if there isn't, it's bad */
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err:
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return (*errcode = -1);
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/* NOTREACHED */
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@ -300,12 +286,10 @@ extern long arith(const char *expr, int *errcode)
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return *numstack;
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} else {
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/* Continue processing the expression. */
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/* Skip whitespace */
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if (isspace(arithval)) {
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goto prologue;
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goto prologue; /* Skip whitespace */
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}
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/* isdigit ? */
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if ((unsigned) arithval - '0' <= 9) {
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if ((unsigned)arithval-'0' <= 9) /* isdigit */ {
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*numstackptr++ = strtol(expr, (char **) &expr, 10);
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lasttok = TOK_NUM;
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goto loop;
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@ -315,21 +299,20 @@ extern long arith(const char *expr, int *errcode)
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goto err;
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}
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#else
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for (p = op_char; *p != arithval; p++) {
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for ( p=op_char ; *p != arithval ; p++ ) {
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if (!*p) {
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goto err;
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}
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}
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#endif
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p = op_token + (int) (p - op_char);
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p = op_token + (int)(p - op_char);
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++expr;
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if ((p >= op_token + NUM_PAIR_EQUAL) || (*expr != '=')) {
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p += NUM_PAIR_EQUAL;
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if ((p >= op_token + NUM_PAIR_SAME + NUM_PAIR_EQUAL)
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|| (*expr != arithval) || (arithval == '!')) {
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--expr;
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/* single = */
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if (arithval == '=') {
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if (arithval == '=') { /* single = */
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goto err;
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}
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p += NUM_PAIR_SAME;
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@ -338,11 +321,9 @@ extern long arith(const char *expr, int *errcode)
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* a number, since it evaluates to one). Think about it.
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* It makes sense. */
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if ((lasttok != TOK_NUM)
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&& (p >=
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(op_token + NUM_PAIR_SAME + NUM_PAIR_EQUAL +
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sizeof(op_char) - 2))) {
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/* Unary plus or minus */
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p += 2;
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&& (p >= op_token + NUM_PAIR_SAME + NUM_PAIR_EQUAL
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+ sizeof(op_char) - 2)) {
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p += 2; /* Unary plus or minus */
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}
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}
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}
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@ -358,11 +339,8 @@ extern long arith(const char *expr, int *errcode)
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/* Left paren is given the lowest priority so it will never be
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* "applied" in this way */
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prec = PREC(op);
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/* not left paren or unary */
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if ((prec > 0) && (prec != UNARYPREC)) {
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/* binary op must be preceded by a num */
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if (lasttok != TOK_NUM) {
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if ((prec > 0) && (prec != UNARYPREC)) { /* not left paren or unary */
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if (lasttok != TOK_NUM) { /* binary op must be preceded by a num */
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goto err;
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}
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while (stackptr != stack) {
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@ -372,10 +350,7 @@ extern long arith(const char *expr, int *errcode)
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* tokens and apply them */
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if (stackptr[-1] == TOK_LPAREN) {
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--stackptr;
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/* Any operator directly after a */
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lasttok = TOK_NUM;
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lasttok = TOK_NUM; /* Any operator directly after a */
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/* close paren should consider itself binary */
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goto prologue;
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}
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@ -383,9 +358,7 @@ extern long arith(const char *expr, int *errcode)
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break;
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}
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*errcode = ARITH_APPLY(*--stackptr);
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if (*errcode) {
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return *errcode;
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}
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if(*errcode) return *errcode;
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}
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if (op == TOK_RPAREN) {
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goto err;
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@ -7,83 +7,15 @@
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#include <stdarg.h>
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#ifdef TEST
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extern void *xrealloc(void *p, size_t size);
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#else
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#include "libbb.h" /* busybox source */
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#endif
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#include "libbb.h"
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/* Exchange glibc vasprintf - minimize allocate memory version */
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/* libc5 and uclibc have not vasprintf function */
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void bb_vasprintf(char **string_ptr, const char *format, va_list args)
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{
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int bs = 128;
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char stack_buff[128];
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char *buff = stack_buff;
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int done;
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/* two or more loop, first - calculate memory size only */
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while(1) {
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done = vsnprintf (buff, bs, format, args);
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/* Different libc have different interpretation vsnprintf returned value */
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if(done >= 0) {
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if(done < bs && buff != stack_buff) {
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/* allocated */
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*string_ptr = buff;
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return;
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} else {
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/* true calculate memory size */
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bs = done+1;
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}
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} else {
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/*
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* Old libc. Incrementaly test.
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* Exact not minimize allocate memory.
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*/
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bs += 128;
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}
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buff = xrealloc((buff == stack_buff ? NULL : buff), bs);
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}
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}
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void bb_asprintf(char **string_ptr, const char *format, ...)
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{
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va_list p;
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va_start(p, format);
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bb_vasprintf(string_ptr, format, p);
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if(vasprintf(string_ptr, format, p)<0)
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error_msg_and_die(memory_exhausted);
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va_end(p);
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}
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#ifdef TEST
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int main(int argc, char **argv)
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{
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char *out_buf;
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char big_buf[200];
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int i;
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bb_asprintf(&out_buf, "Hi!\nargc=%d argv[0]=%s\n", argc, argv[0]);
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printf(out_buf);
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free(out_buf);
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for(i=0; i < sizeof(big_buf)-1; i++)
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big_buf[i]='x';
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big_buf[i]=0;
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bb_asprintf(&out_buf, "Test Big\n%s\n", big_buf);
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printf(out_buf);
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free(out_buf);
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return 0;
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}
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void *xrealloc(void *p, size_t size)
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{
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void *p2 = realloc(p, size);
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if(p2==0) {
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fprintf(stderr, "TEST: memory_exhausted\n");
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exit(1);
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}
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return p2;
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}
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#endif
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