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https://github.com/sheumann/hush.git
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hush: speed up o_addX{chr,str}
function old new delta o_addQstr - 162 +162 o_addQchr - 89 +89 o_addstr - 58 +58 o_addqchr 50 81 +31 expand_on_ifs 103 97 -6 add_till_backquote 92 82 -10 expand_variables 1281 1217 -64 parse_stream 1675 1609 -66 o_addqstr 155 - -155 ------------------------------------------------------------------------------ (add/remove: 3/1 grow/shrink: 1/4 up/down: 340/-301) Total: 39 bytes text data bss dec hex filename 759870 604 6684 767158 bb4b6 busybox_old 759909 604 6684 767197 bb4dd busybox_unstripped
This commit is contained in:
Denis Vlasenko
parent
76db5adbf7
commit
7e3d33b6ce
105
shell/hush.c
105
shell/hush.c
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@ -1213,28 +1213,63 @@ static void o_addstr(o_string *o, const char *str, int len)
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/* My analysis of quoting semantics tells me that state information
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* is associated with a destination, not a source.
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*/
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static void o_addqchr(o_string *o, int ch, int quote)
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static void o_addqchr(o_string *o, int ch)
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{
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if (quote && strchr("*?[\\", ch)) {
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o_addchr(o, '\\');
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int sz = 1;
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if (strchr("*?[\\", ch)) {
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sz++;
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o->data[o->length] = '\\';
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o->length++;
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}
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o_addchr(o, ch);
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o_grow_by(o, sz);
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o->data[o->length] = ch;
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o->length++;
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o->data[o->length] = '\0';
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}
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static void o_addqstr(o_string *o, const char *str, int len, int quote)
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static void o_addQchr(o_string *o, int ch)
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{
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char ch;
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if (!quote || str[strcspn(str, "*?[\\")] == '\0') {
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int sz = 1;
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if (o->o_quote && strchr("*?[\\", ch)) {
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sz++;
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o->data[o->length] = '\\';
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o->length++;
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}
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o_grow_by(o, sz);
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o->data[o->length] = ch;
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o->length++;
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o->data[o->length] = '\0';
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}
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static void o_addQstr(o_string *o, const char *str, int len)
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{
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if (!o->o_quote) {
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o_addstr(o, str, len);
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return;
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}
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while (len) {
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char ch;
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int sz;
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int ordinary_cnt = strcspn(str, "*?[\\");
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if (ordinary_cnt > len) /* paranoia */
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ordinary_cnt = len;
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o_addstr(o, str, ordinary_cnt);
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if (ordinary_cnt == len)
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return;
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str += ordinary_cnt;
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len -= ordinary_cnt - 1; /* we are processing + 1 char below */
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ch = *str++;
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if (ch && strchr("*?[\\", ch)) {
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o_addchr(o, '\\');
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sz = 1;
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if (ch) { /* it is necessarily one of "*?[\\" */
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sz++;
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o->data[o->length] = '\\';
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o->length++;
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}
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o_addchr(o, ch);
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len--;
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o_grow_by(o, sz);
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o->data[o->length] = ch;
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o->length++;
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o->data[o->length] = '\0';
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}
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}
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@ -2566,7 +2601,7 @@ static int expand_on_ifs(o_string *output, int n, const char *str)
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while (1) {
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int word_len = strcspn(str, ifs);
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if (word_len) {
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o_addqstr(output, str, word_len, output->o_quote);
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o_addQstr(output, str, word_len);
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str += word_len;
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}
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if (!*str) /* EOL - do not finalize word */
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@ -2607,7 +2642,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
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o_string subst_result = NULL_O_STRING;
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o_addqstr(output, arg, p - arg, output->o_quote);
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o_addQstr(output, arg, p - arg);
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o_debug_list("expand_vars_to_list[1]", output, n);
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arg = ++p;
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p = strchr(p, SPECIAL_VAR_SYMBOL);
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@ -2653,7 +2688,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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* and in this case should treat it like '$*' - see 'else...' below */
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if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
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while (1) {
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o_addqstr(output, global_argv[i], strlen(global_argv[i]), output->o_quote);
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o_addQstr(output, global_argv[i], strlen(global_argv[i]));
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if (++i >= global_argc)
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break;
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o_addchr(output, '\0');
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@ -2662,7 +2697,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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}
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} else { /* quoted $*: add as one word */
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while (1) {
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o_addqstr(output, global_argv[i], strlen(global_argv[i]), output->o_quote);
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o_addQstr(output, global_argv[i], strlen(global_argv[i]));
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if (!global_argv[++i])
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break;
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if (ifs[0])
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@ -2702,7 +2737,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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} /* else: quoted $VAR, val will be appended below */
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}
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if (val) {
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o_addqstr(output, val, strlen(val), output->o_quote);
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o_addQstr(output, val, strlen(val));
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}
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o_free(&subst_result);
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@ -2711,7 +2746,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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if (arg[0]) {
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o_debug_list("expand_vars_to_list[a]", output, n);
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o_addqstr(output, arg, strlen(arg) + 1, output->o_quote);
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o_addQstr(output, arg, strlen(arg) + 1);
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o_debug_list("expand_vars_to_list[b]", output, n);
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} else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
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&& !(ored_ch & 0x80) /* and all vars were not quoted. */
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@ -3335,10 +3370,10 @@ static int process_command_subs(o_string *dest,
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continue;
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}
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while (eol_cnt) {
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o_addqchr(dest, '\n', dest->o_quote);
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o_addQchr(dest, '\n');
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eol_cnt--;
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}
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o_addqchr(dest, ch, dest->o_quote);
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o_addQchr(dest, ch);
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}
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debug_printf("done reading from pipe, pclose()ing\n");
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@ -3407,7 +3442,7 @@ static void add_till_single_quote(o_string *dest, struct in_str *input)
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break;
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if (ch == '\'')
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break;
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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}
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}
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/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
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@ -3418,15 +3453,15 @@ static void add_till_double_quote(o_string *dest, struct in_str *input)
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if (ch == '"')
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break;
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if (ch == '\\') { /* \x. Copy both chars. */
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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ch = i_getch(input);
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}
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if (ch == EOF)
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break;
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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if (ch == '`') {
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add_till_backquote(dest, input);
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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continue;
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}
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// if (ch == '$') ...
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@ -3455,12 +3490,12 @@ static void add_till_backquote(o_string *dest, struct in_str *input)
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if (ch == '\\') { /* \x. Copy both chars unless it is \` */
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int ch2 = i_getch(input);
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if (ch2 != '`' && ch2 != '$' && ch2 != '\\')
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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ch = ch2;
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}
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if (ch == EOF)
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break;
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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}
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}
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/* Process $(cmd) - copy contents until ")" is seen. Complicated by
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@ -3487,22 +3522,22 @@ static void add_till_closing_curly_brace(o_string *dest, struct in_str *input)
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if (ch == ')')
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if (--count < 0)
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break;
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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if (ch == '\'') {
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add_till_single_quote(dest, input);
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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continue;
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}
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if (ch == '"') {
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add_till_double_quote(dest, input);
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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continue;
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}
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if (ch == '\\') { /* \x. Copy verbatim. Important for \(, \) */
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ch = i_getch(input);
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if (ch == EOF)
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break;
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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continue;
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}
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}
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@ -3581,7 +3616,7 @@ static int handle_dollar(o_string *dest, struct in_str *input)
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return 1;
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break;
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default:
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o_addqchr(dest, '$', dest->o_quote);
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o_addQchr(dest, '$');
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}
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debug_printf_parse("handle_dollar return 0\n");
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return 0;
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@ -3621,7 +3656,7 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
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debug_printf_parse("parse_stream return 1: unterminated \"\n");
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return 1;
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}
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o_addqchr(dest, ch, dest->o_quote);
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o_addQchr(dest, ch);
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continue;
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}
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if (m == CHAR_IFS) {
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@ -3656,7 +3691,7 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
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i_getch(input);
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}
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} else {
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o_addqchr(dest, ch, dest->o_quote);
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o_addQchr(dest, ch);
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}
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break;
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case '\\':
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@ -3676,9 +3711,9 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
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*/
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if (dest->o_quote) {
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if (strchr("$`\"\\", next) != NULL) {
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o_addqchr(dest, i_getch(input), 1);
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o_addqchr(dest, i_getch(input));
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} else {
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o_addqchr(dest, '\\', 1);
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o_addqchr(dest, '\\');
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}
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} else {
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o_addchr(dest, '\\');
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@ -3697,7 +3732,7 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
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ch = i_getch(input);
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if (ch == EOF || ch == '\'')
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break;
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o_addqchr(dest, ch, 1);
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o_addqchr(dest, ch);
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}
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if (ch == EOF) {
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syntax("unterminated '");
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