bc: fix handling of comment/string interactions while buffering input
function old new delta zbc_lex_next 1965 1982 +17 zbc_num_divmod 150 156 +6 bc_read_line 411 394 -17 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/1 up/down: 23/-17) Total: 6 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Denys Vlasenko
parent
94576d2b97
commit
63ad799384
112
miscutils/bc.c
112
miscutils/bc.c
@ -1147,23 +1147,6 @@ static void bc_vec_string(BcVec *v, size_t len, const char *str)
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bc_vec_pushZeroByte(v);
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}
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#if ENABLE_FEATURE_BC_SIGNALS && ENABLE_FEATURE_EDITING
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static void bc_vec_concat(BcVec *v, const char *str)
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{
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size_t len, slen;
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if (v->len == 0) bc_vec_pushZeroByte(v);
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slen = strlen(str);
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len = v->len + slen;
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if (v->cap < len) bc_vec_grow(v, slen);
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strcpy(v->v + v->len - 1, str);
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v->len = len;
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}
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#endif
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static void *bc_vec_item(const BcVec *v, size_t idx)
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{
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return v->v + v->size * idx;
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@ -2491,6 +2474,21 @@ static FAST_FUNC void bc_result_free(void *result)
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}
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}
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#if ENABLE_FEATURE_BC_SIGNALS && ENABLE_FEATURE_EDITING
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static void bc_vec_concat(BcVec *v, const char *str)
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{
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size_t len, slen;
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slen = strlen(str);
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len = v->len + slen + 1;
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if (v->cap < len) bc_vec_grow(v, slen);
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strcpy(v->v + v->len, str);
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v->len = len;
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}
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#endif
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static int bad_input_byte(char c)
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{
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if ((c < ' ' && c != '\t' && c != '\r' && c != '\n') // also allow '\v' '\f'?
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@ -2887,7 +2885,7 @@ static void bc_lex_file(void)
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static bool bc_lex_more_input(void)
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{
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BcParse *p = &G.prs;
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size_t str;
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unsigned str; // bool for bc, string nest count for dc
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bool comment;
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bc_vec_pop_all(&G.input_buffer);
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@ -2896,8 +2894,23 @@ static bool bc_lex_more_input(void)
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// with a backslash to the parser. The reason for that is because the parser
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// treats a backslash+newline combo as whitespace, per the bc spec. In that
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// case, and for strings and comments, the parser will expect more stuff.
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comment = false;
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//
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// bc cases to test interactively:
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// 1 #comment\ - prints "1<newline>" at once (comment is not continued)
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// 1 #comment/* - prints "1<newline>" at once
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// 1 #comment" - prints "1<newline>" at once
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// 1\#comment - error at once (\ is not a line continuation)
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// 1 + /*"*/2 - prints "3<newline>" at once
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// 1 + /*#*/2 - prints "3<newline>" at once
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// "str\" - prints "str\" at once
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// "str#" - prints "str#" at once
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// "str/*" - prints "str/*" at once
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// "str#\ - waits for second line
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// end" - ...prints "str#\<newline>end"
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//This is way too complex, we duplicate comment/string logic of lexer
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//TODO: switch to char-by-char input like hush does it
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str = 0;
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comment = false; // stays always false for dc
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for (;;) {
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size_t prevlen = G.input_buffer.len;
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char *string;
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@ -2909,39 +2922,61 @@ static bool bc_lex_more_input(void)
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string = G.input_buffer.v + prevlen;
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while (*string) {
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char c = *string;
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if (!comment) {
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if (string == G.input_buffer.v || string[-1] != '\\') {
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if (IS_BC)
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str ^= (c == '"');
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else {
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if (c == ']')
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str -= 1;
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else if (c == '[')
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str += 1;
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}
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char c = *string++;
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#if ENABLE_BC
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if (comment) {
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// We are in /**/ comment, exit only on "*/"
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if (c == '*' && *string == '/') {
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comment = false;
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string++;
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}
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continue;
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}
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string++;
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if (!str) {
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#endif
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// We are not in /**/ comment
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if (str) {
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// We are in "string" (bc) or [string] (dc)
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if (IS_BC) {
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// bc strings have no escapes: \\ is not special,
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// \n is not, \" is not, \<newline> is not.
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str = (c != '"'); // clear flag when " is seen
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} else {
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// dc strings have no escapes as well, can nest
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if (c == ']')
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str--;
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if (c == '[')
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str++;
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}
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continue;
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}
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// We are not in a string or /**/ comment
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// Is it a #comment? Return the string (can't have continuation)
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if (c == '#')
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goto return_string;
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#if ENABLE_BC
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if (IS_BC) {
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// bc: is it a start of /**/ comment or string?
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if (c == '/' && *string == '*') {
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comment = true;
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string++;
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continue;
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}
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if (c == '*' && *string == '/') {
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comment = false;
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string++;
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}
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str = (c == '"'); // set flag if " is seen
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continue;
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}
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}
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#endif
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// dc: is it a start of string?
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str = (c == '[');
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} // end of "check all chars in string" loop
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if (str != 0 || comment) {
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G.input_buffer.len--; // backstep over the trailing NUL byte
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continue;
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}
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// Check for backslash+newline.
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// we do not check that last char is '\n' -
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// We do not check that last char is '\n' -
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// if it is not, then it's EOF, and looping back
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// to bc_read_line() will detect it:
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string -= 2;
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@ -2952,6 +2987,7 @@ static bool bc_lex_more_input(void)
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break;
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}
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return_string:
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p->lex_inbuf = G.input_buffer.v;
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// bb_error_msg("G.input_buffer.len:%d '%s'", G.input_buffer.len, G.input_buffer.v);
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