lineedit: reduce stack usage
netstat: reduce stack usage; fix handling of NULs in unix socket filenames static.has_inode 1 - -1 do_info 119 116 -3 deinit_S 60 51 -9 unix_do_one 578 451 -127 parse_and_put_prompt 966 825 -141 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 0/4 up/down: 0/-281) Total: -281 bytes
This commit is contained in:
Denis Vlasenko
parent
2bec513996
commit
7221c8c22d
@ -91,7 +91,6 @@ struct statics {
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const char *cmdedit_prompt;
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#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
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char *hostname_buf;
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int num_ok_lines; /* = 1; */
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#endif
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@ -136,7 +135,6 @@ static struct statics *const ptr_to_statics __attribute__ ((section (".data")));
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#define command_len (S.command_len )
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#define command_ps (S.command_ps )
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#define cmdedit_prompt (S.cmdedit_prompt )
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#define hostname_buf (S.hostname_buf )
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#define num_ok_lines (S.num_ok_lines )
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#define user_buf (S.user_buf )
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#define home_pwd_buf (S.home_pwd_buf )
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@ -155,7 +153,6 @@ static struct statics *const ptr_to_statics __attribute__ ((section (".data")));
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static void deinit_S(void)
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{
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#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
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free(hostname_buf);
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/* This one is allocated only if FANCY_PROMPT is on
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* (otherwise it points to verbatim prompt (NOT malloced) */
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free((char*)cmdedit_prompt);
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@ -381,14 +378,14 @@ static void username_tab_completion(char *ud, char *with_shash_flg)
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if (with_shash_flg) { /* "~/..." or "~user/..." */
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char *sav_ud = ud - 1;
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char *home = NULL;
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char *temp;
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if (*ud == '/') { /* "~/..." */
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home = home_pwd_buf;
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} else {
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/* "~user/..." */
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char *temp;
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temp = strchr(ud, '/');
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*temp = 0; /* ~user\0 */
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*temp = '\0'; /* ~user\0 */
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entry = getpwnam(ud);
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*temp = '/'; /* restore ~user/... */
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ud = temp;
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@ -1163,21 +1160,23 @@ static void parse_and_put_prompt(const char *prmt_ptr)
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size_t cur_prmt_len = 0;
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char flg_not_length = '[';
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char *prmt_mem_ptr = xzalloc(1);
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char *pwd_buf = xrealloc_getcwd_or_warn(NULL);
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char buf2[PATH_MAX + 1];
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char buf[2];
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char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
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char cbuf[2];
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char c;
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char *pbuf;
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cmdedit_prmt_len = 0;
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if (!pwd_buf) {
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pwd_buf = (char *)bb_msg_unknown;
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if (!cwd_buf) {
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cwd_buf = (char *)bb_msg_unknown;
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}
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cbuf[1] = '\0'; /* never changes */
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while (*prmt_ptr) {
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pbuf = buf;
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pbuf[1] = 0;
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char *free_me = NULL;
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pbuf = cbuf;
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c = *prmt_ptr++;
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if (c == '\\') {
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const char *cp = prmt_ptr;
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@ -1188,6 +1187,7 @@ static void parse_and_put_prompt(const char *prmt_ptr)
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if (*cp == '\0')
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break;
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c = *prmt_ptr++;
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switch (c) {
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#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
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case 'u':
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@ -1195,87 +1195,81 @@ static void parse_and_put_prompt(const char *prmt_ptr)
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break;
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#endif
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case 'h':
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pbuf = hostname_buf;
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if (!pbuf) {
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pbuf = xzalloc(256);
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pbuf = free_me = xzalloc(256);
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if (gethostname(pbuf, 255) < 0) {
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strcpy(pbuf, "?");
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} else {
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char *s = strchr(pbuf, '.');
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if (s)
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*s = '\0';
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}
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hostname_buf = pbuf;
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pbuf[0] = '?';
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pbuf[1] = '\0';
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}
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*strchrnul(pbuf, '.') = '\0';
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break;
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case '$':
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c = (geteuid() == 0 ? '#' : '$');
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break;
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#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
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case 'w':
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pbuf = pwd_buf;
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/* /home/user[/something] -> ~[/something] */
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pbuf = cwd_buf;
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l = strlen(home_pwd_buf);
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if (l != 0
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&& strncmp(home_pwd_buf, pbuf, l) == 0
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&& (pbuf[l]=='/' || pbuf[l]=='\0')
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&& strlen(pwd_buf+l) < PATH_MAX
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&& strncmp(home_pwd_buf, cwd_buf, l) == 0
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&& (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
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&& strlen(cwd_buf + l) < PATH_MAX
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) {
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pbuf = buf2;
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*pbuf = '~';
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strcpy(pbuf+1, pwd_buf+l);
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pbuf = free_me = xasprintf("~%s", cwd_buf + l);
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}
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break;
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#endif
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case 'W':
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pbuf = pwd_buf;
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pbuf = cwd_buf;
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cp = strrchr(pbuf, '/');
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if (cp != NULL && cp != pbuf)
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pbuf += (cp-pbuf) + 1;
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break;
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case '!':
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pbuf = buf2;
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snprintf(buf2, sizeof(buf2), "%d", num_ok_lines);
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pbuf = free_me = xasprintf("%d", num_ok_lines);
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break;
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case 'e': case 'E': /* \e \E = \033 */
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c = '\033';
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break;
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case 'x': case 'X':
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case 'x': case 'X': {
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char buf2[4];
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for (l = 0; l < 3;) {
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int h;
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unsigned h;
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buf2[l++] = *prmt_ptr;
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buf2[l] = 0;
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h = strtol(buf2, &pbuf, 16);
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buf2[l] = '\0';
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h = strtoul(buf2, &pbuf, 16);
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if (h > UCHAR_MAX || (pbuf - buf2) < l) {
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l--;
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buf2[--l] = '\0';
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break;
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}
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prmt_ptr++;
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}
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buf2[l] = 0;
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c = (char)strtol(buf2, NULL, 16);
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c = (char)strtoul(buf2, NULL, 16);
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if (c == 0)
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c = '?';
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pbuf = buf;
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pbuf = cbuf;
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break;
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}
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case '[': case ']':
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if (c == flg_not_length) {
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flg_not_length = (flg_not_length == '[' ? ']' : '[');
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continue;
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}
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break;
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}
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}
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}
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if (pbuf == buf)
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*pbuf = c;
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} /* switch */
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} /* if */
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} /* if */
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cbuf[0] = c;
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cur_prmt_len = strlen(pbuf);
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prmt_len += cur_prmt_len;
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if (flg_not_length != ']')
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cmdedit_prmt_len += cur_prmt_len;
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prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
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}
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if (pwd_buf != (char *)bb_msg_unknown)
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free(pwd_buf);
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free(free_me);
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} /* while */
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if (cwd_buf != (char *)bb_msg_unknown)
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free(cwd_buf);
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cmdedit_prompt = prmt_mem_ptr;
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put_prompt();
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}
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@ -1397,7 +1391,6 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
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if (entry) {
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user_buf = xstrdup(entry->pw_name);
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home_pwd_buf = xstrdup(entry->pw_dir);
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/* They are not freed on exit (too small to bother) */
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}
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}
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#endif
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@ -148,7 +148,7 @@ static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int
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return host_port;
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}
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static void tcp_do_one(int lnr, const char *line)
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static void tcp_do_one(int lnr, char *line)
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{
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char local_addr[64], rem_addr[64];
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char more[512];
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@ -201,7 +201,7 @@ static void tcp_do_one(int lnr, const char *line)
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}
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}
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static void udp_do_one(int lnr, const char *line)
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static void udp_do_one(int lnr, char *line)
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{
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char local_addr[64], rem_addr[64];
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const char *state_str;
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@ -283,7 +283,7 @@ static void udp_do_one(int lnr, const char *line)
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}
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}
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static void raw_do_one(int lnr, const char *line)
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static void raw_do_one(int lnr, char *line)
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{
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char local_addr[64], rem_addr[64];
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char more[512];
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@ -339,31 +339,37 @@ static void raw_do_one(int lnr, const char *line)
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}
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}
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static void unix_do_one(int nr, const char *line)
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static void unix_do_one(int nr, char *line)
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{
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static smallint has_inode = 0;
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char path[PATH_MAX], ss_flags[32];
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const char *ss_proto, *ss_state, *ss_type;
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int num, state, type, inode;
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void *d;
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unsigned long refcnt, proto, unix_flags;
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unsigned long inode;
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int type, state;
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int num, path_ofs;
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void *d;
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const char *ss_proto, *ss_state, *ss_type;
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char ss_flags[32];
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if (nr == 0) {
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if (strstr(line, "Inode"))
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has_inode = 1;
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if (nr == 0)
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return; /* skip header */
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{
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char *last = last_char_is(line, '\n');
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if (last)
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*last = '\0';
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}
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/* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
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* (those ^@ are NUL bytes). fgets sees them as tons of empty lines. */
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if (!line[0])
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return;
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path_ofs = 0; /* paranoia */
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num = sscanf(line, "%p: %lX %lX %lX %X %X %lu %n",
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&d, &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
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if (num < 7) {
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bb_error_msg("got bogus unix line '%s'", line);
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return;
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}
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path[0] = '\0';
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num = sscanf(line, "%p: %lX %lX %lX %X %X %d %s",
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&d, &refcnt, &proto, &unix_flags, &type, &state, &inode, path);
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if (num < 6) {
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bb_error_msg("warning, got bogus unix line");
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return;
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}
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if (!has_inode)
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sprintf(path, "%d", inode);
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if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
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if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
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if (!(flags & NETSTAT_LISTENING))
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@ -439,13 +445,9 @@ static void unix_do_one(int nr, const char *line)
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strcat(ss_flags, "N ");
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strcat(ss_flags, "]");
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printf("%-5s %-6ld %-11s %-10s %-13s ",
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ss_proto, refcnt, ss_flags, ss_type, ss_state);
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if (has_inode)
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printf("%-6d ", inode);
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else
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printf("- ");
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puts(path);
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printf("%-5s %-6ld %-11s %-10s %-13s %6lu %s\n",
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ss_proto, refcnt, ss_flags, ss_type, ss_state, inode,
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line + path_ofs);
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}
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#define _PATH_PROCNET_UDP "/proc/net/udp"
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@ -456,10 +458,11 @@ static void unix_do_one(int nr, const char *line)
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#define _PATH_PROCNET_RAW6 "/proc/net/raw6"
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#define _PATH_PROCNET_UNIX "/proc/net/unix"
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static void do_info(const char *file, const char *name, void (*proc)(int, const char *))
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static void do_info(const char *file, const char *name, void (*proc)(int, char *))
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{
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int lnr = 0;
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int lnr;
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FILE *procinfo;
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char *buffer;
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procinfo = fopen(file, "r");
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if (procinfo == NULL) {
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@ -470,13 +473,14 @@ static void do_info(const char *file, const char *name, void (*proc)(int, const
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}
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return;
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}
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lnr = 0;
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do {
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char *buffer = xmalloc_fgets(procinfo);
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buffer = xmalloc_fgets(procinfo);
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if (buffer) {
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(proc)(lnr++, buffer);
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free(buffer);
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}
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} while (!feof(procinfo));
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} while (buffer);
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fclose(procinfo);
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}
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