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https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
synced 2024-11-15 22:15:13 +08:00
7ac29190db
The lexer will go with the longest match, so previously the starting double quotes of a string would be swallowed by the [^ \t\r\n()]+ pattern leaving the user no way to actually use strings with escape sequences. Fix this by not allowing this case to start with double quotes. Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
147 lines
3.4 KiB
Plaintext
147 lines
3.4 KiB
Plaintext
/* SPDX-License-Identifier: GPL-2.0 */
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%{
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#include "emp_ematch.yacc.h"
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#include "m_ematch.h"
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extern int ematch_argc;
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extern char **ematch_argv;
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#define yylval ematch_lval
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#define NEXT_EM_ARG() do { ematch_argc--; ematch_argv++; } while(0);
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#define YY_INPUT(buf, result, max_size) \
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{ \
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next: \
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if (ematch_argc <= 0) \
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result = YY_NULL; \
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else if (**ematch_argv == '\0') { \
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NEXT_EM_ARG(); \
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goto next; \
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} else { \
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if (max_size <= strlen(*ematch_argv) + 1) { \
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fprintf(stderr, "match argument too long.\n"); \
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result = YY_NULL; \
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} else { \
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strcpy(buf, *ematch_argv); \
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result = strlen(*ematch_argv) + 1; \
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buf[result-1] = ' '; \
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buf[result] = '\0'; \
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NEXT_EM_ARG(); \
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} \
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} \
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}
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static void __attribute__ ((unused)) yyunput (int c,char *buf_ptr );
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static void __attribute__ ((unused)) yy_push_state (int new_state );
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static void __attribute__ ((unused)) yy_pop_state (void);
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static int __attribute__ ((unused)) yy_top_state (void );
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static char *strbuf;
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static unsigned int strbuf_size;
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static unsigned int strbuf_index;
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static void strbuf_enlarge(void)
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{
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strbuf_size += 512;
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strbuf = realloc(strbuf, strbuf_size);
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}
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static void strbuf_append_char(char c)
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{
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while (strbuf_index >= strbuf_size)
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strbuf_enlarge();
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strbuf[strbuf_index++] = c;
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}
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static void strbuf_append_charp(char *s)
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{
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while (strbuf_index >= strbuf_size)
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strbuf_enlarge();
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memcpy(strbuf + strbuf_index, s, strlen(s));
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strbuf_index += strlen(s);
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}
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%}
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%x lexstr
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%option 8bit stack warn noyywrap prefix="ematch_"
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%%
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[ \t\r\n]+
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\" {
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if (strbuf == NULL) {
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strbuf_size = 512;
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strbuf = calloc(1, strbuf_size);
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if (strbuf == NULL)
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return ERROR;
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}
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strbuf_index = 0;
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BEGIN(lexstr);
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}
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<lexstr>\" {
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BEGIN(INITIAL);
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yylval.b = bstr_new(strbuf, strbuf_index);
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yylval.b->quoted = 1;
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return ATTRIBUTE;
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}
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<lexstr>\\[0-7]{1,3} { /* octal escape sequence */
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int res;
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sscanf(yytext + 1, "%o", &res);
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if (res > 0xFF) {
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fprintf(stderr, "error: octal escape sequence" \
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" out of range\n");
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return ERROR;
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}
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strbuf_append_char((unsigned char) res);
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}
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<lexstr>\\[0-9]+ { /* catch wrong octal escape seq. */
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fprintf(stderr, "error: invalid octale escape sequence\n");
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return ERROR;
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}
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<lexstr>\\x[0-9a-fA-F]{1,2} {
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int res;
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sscanf(yytext + 2, "%x", &res);
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if (res > 0xFF) {
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fprintf(stderr, "error: hexadecimal escape " \
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"sequence out of range\n");
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return ERROR;
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}
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strbuf_append_char((unsigned char) res);
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}
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<lexstr>\\n strbuf_append_char('\n');
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<lexstr>\\r strbuf_append_char('\r');
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<lexstr>\\t strbuf_append_char('\t');
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<lexstr>\\v strbuf_append_char('\v');
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<lexstr>\\b strbuf_append_char('\b');
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<lexstr>\\f strbuf_append_char('\f');
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<lexstr>\\a strbuf_append_char('\a');
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<lexstr>\\(.|\n) strbuf_append_char(yytext[1]);
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<lexstr>[^\\\n\"]+ strbuf_append_charp(yytext);
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[aA][nN][dD] return AND;
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[oO][rR] return OR;
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[nN][oO][tT] return NOT;
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"(" |
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")" {
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return yylval.i = *yytext;
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}
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[^" \t\r\n()][^ \t\r\n()]* {
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yylval.b = bstr_alloc(yytext);
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if (yylval.b == NULL)
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return ERROR;
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return ATTRIBUTE;
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}
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%%
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