319 lines
7.5 KiB
C
319 lines
7.5 KiB
C
/*
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scconfig - detection of printf-related features
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Copyright (C) 2009 Tibor Palinkas
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Project page: http://repo.hu/projects/scconfig
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Contact (email and IRC): http://igor2.repo.hu/contact.html
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "libs.h"
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#include "log.h"
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#include "db.h"
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#include "dep.h"
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static int tryx(int logdepth, const char *test_c, const char *trying, const char *expected)
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{
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char *out = NULL;
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char buff[512];
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logprintf(logdepth, "trying '%s'\n", trying);
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sprintf(buff, test_c, trying, trying);
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if (compile_run(logdepth+1, buff, NULL, NULL, NULL, &out) == 0) {
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if (strncmp(out, expected, strlen(expected)) == 0) {
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free(out);
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return 1;
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}
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free(out);
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}
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return 0;
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}
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static int tryc(int logdepth, const char *test_c, const char *trying)
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{
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char *out = NULL;
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char buff[512];
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char *spc, *end;
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logprintf(logdepth, "trying '%s'\n", trying);
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sprintf(buff, test_c, trying);
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if (compile_run(logdepth+1, buff, NULL, NULL, NULL, &out) == 0) {
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spc = str_chr(out, ' ');
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if (spc == NULL)
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return 0;
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*spc = '\0';
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spc++;
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end = str_chr(spc, ' ');
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if (end == NULL)
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return 0;
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*end = '\0';
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if (strcmp(out, spc) == 0) {
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free(out);
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put("libs/printf_ptrcast", trying);
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report("OK (%s)\n", trying);
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return 1;
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}
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free(out);
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}
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return 0;
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}
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int find_printf_x(const char *name, int logdepth, int fatal)
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{
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const char *pfx;
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char *test_c =
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NL "#include <stdlib.h>"
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NL "#include <stdio.h>"
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NL "int main() {"
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NL " printf(\"'%s%%x'/'%s%%x'\\n\", (size_t)0x1234, NULL);"
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NL " return 0;"
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NL "}"
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NL;
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char *expected = "'0x1234'/'0x0'";
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require("cc/cc", logdepth, fatal);
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report("Checking for printf %%x prefix... ");
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logprintf(logdepth, "find_printf_x: trying to find printf %%x prefix...\n");
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logdepth++;
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pfx = get("/arg/libs/printf_x");
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if (pfx == NULL) {
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if (tryx(logdepth, test_c, "", expected)) {
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put("libs/printf_x", "");
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report("OK ()\n");
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return 0;
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}
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if (tryx(logdepth, test_c, "0x", expected)) {
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put("libs/printf_x", "0x");
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report("OK (0x)\n");
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return 0;
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}
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}
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else {
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report("User provided... ");
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if (tryx(logdepth, test_c, pfx, expected)) {
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put("libs/printf_x", pfx);
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report("OK (%s)\n", pfx);
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return 0;
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}
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}
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return 1;
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}
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int find_printf_ptrcast(const char *name, int logdepth, int fatal)
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{
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const char *cast;
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char *test_c =
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NL "#include <stdlib.h>"
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NL "#include <stdio.h>"
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NL "int main() {"
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NL " printf(\"%%d %%d \\n\", sizeof(void *), sizeof(%s));"
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NL " return 0;"
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NL "}"
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NL;
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require("cc/cc", logdepth, fatal);
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report("Checking for printf %%x pointer cast... ");
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logprintf(logdepth, "find_printf_ptrcast: trying to find printf %%x pointer cast...\n");
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logdepth++;
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cast = get("/arg/libs/printf_ptrcast");
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if (cast == NULL) {
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if (tryc(logdepth, test_c, "unsigned int")) return 0;
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if (tryc(logdepth, test_c, "unsigned long")) return 0;
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if (tryc(logdepth, test_c, "unsigned long long")) return 0;
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}
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else {
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report("User provided... ");
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if (tryc(logdepth, test_c, cast)) return 0;
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}
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return 1;
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}
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int find_snprintf(const char *name, int logdepth, int fatal)
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{
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char *out;
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char *test_c =
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NL "#include <stdlib.h>"
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NL "#include <stdio.h>"
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NL "int main() {"
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NL " char buff[9];"
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NL " char *s = buff+2;"
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NL
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NL " /* build a fence */"
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NL " buff[0] = 0;"
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NL " buff[1] = 65;"
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NL " buff[7] = 66;"
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NL " buff[8] = 0;"
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NL
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NL " snprintf(s, 4, \"%d\", 123456);"
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NL " if ((buff[0] == 0) && (buff[1] == 65) && (buff[7] == 65) && (buff[8] == 0))"
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NL " printf(\"%s\\n\", s);"
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NL " return 0;"
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NL "}"
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NL;
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require("cc/cc", logdepth, fatal);
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report("Checking for snprintf... ");
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logprintf(logdepth, "find_snprintf_works: trying to find snprintf...\n");
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logdepth++;
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logprintf(logdepth, "trying snprintf...\n");
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if (compile_run(logdepth+1, test_c, NULL, NULL, NULL, &out) == 0) {
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if (cross_blind) {
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put("libs/snprintf", strue);
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report("OK (can't check if safe)\n");
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free(out);
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return 0;
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}
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if (strcmp(out, "123")) {
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put("libs/snprintf", strue);
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put("libs/snprintf_safe", strue);
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report("OK (safe)\n");
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free(out);
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return 0;
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}
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if (strcmp(out, "1234")) {
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put("libs/snprintf", strue);
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put("libs/snprintf_safe", sfalse);
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report("OK (UNSAFE)\n");
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free(out);
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return 0;
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}
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free(out);
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report("not found (broken output).\n");
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}
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else {
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report("not found (no output).\n");
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}
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put("libs/snprintf", sfalse);
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return 1;
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}
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int find_dprintf(const char *name, int logdepth, int fatal)
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{
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char *out;
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char *test_c =
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NL "#include <stdlib.h>"
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NL "#include <stdio.h>"
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NL "int main() {"
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NL " dprintf(1, \"OK\\n\");"
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NL " return 0;"
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NL "}"
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NL;
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require("cc/cc", logdepth, fatal);
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report("Checking for dprintf... ");
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logprintf(logdepth, "find_dprintf: trying to find dprintf...\n");
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logdepth++;
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logprintf(logdepth, "trying dprintf...\n");
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if ((compile_run(logdepth+1, test_c, NULL, NULL, NULL, &out) == 0) && (strcmp(out, "OK"))) {
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put("libs/dprintf", strue);
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report("found\n");
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free(out);
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return 0;
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}
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put("libs/dprintf", sfalse);
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report("not found\n");
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return 1;
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}
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int find_vdprintf(const char *name, int logdepth, int fatal)
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{
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char *out;
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char *test_c =
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NL "#include <stdlib.h>"
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NL "#include <stdio.h>"
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NL "#include <stdarg.h>"
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NL "void local_dprintf(int fd, const char *fmt, ...)"
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NL "{"
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NL " va_list ap;"
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NL " va_start(ap, fmt);"
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NL " vdprintf(fd, fmt, ap);"
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NL "}"
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NL "int main() {"
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NL " local_dprintf(1, \"OK\\n\");"
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NL " return 0;"
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NL "}"
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NL;
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require("cc/cc", logdepth, fatal);
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report("Checking for vdprintf... ");
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logprintf(logdepth, "find_vdprintf: trying to find vdprintf...\n");
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logdepth++;
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logprintf(logdepth, "trying vdprintf...\n");
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if ((compile_run(logdepth+1, test_c, NULL, NULL, NULL, &out) == 0) && (strcmp(out, "OK"))) {
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put("libs/vdprintf", strue);
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report("found\n");
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free(out);
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return 0;
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}
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put("libs/vdprintf", sfalse);
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report("not found\n");
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return 1;
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}
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int find_vsnprintf(const char *name, int logdepth, int fatal)
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{
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char *out;
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char *test_c =
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NL "#include <stdlib.h>"
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NL "#include <stdio.h>"
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NL "#include <stdarg.h>"
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NL "void local_vsnprintf(char *s, int len, const char *fmt, ...)"
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NL "{"
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NL " va_list ap;"
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NL " va_start(ap, fmt);"
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NL " vsnprintf(s, len, fmt, ap);"
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NL "}"
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NL "int main() {"
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NL " char s[16];"
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NL " *s = '\\0';"
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NL " local_vsnprintf(s, 14, \"OK\\n\");"
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NL " printf(\"%s\", s);"
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NL " return 0;"
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NL "}"
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NL;
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require("cc/cc", logdepth, fatal);
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report("Checking for vsnprintf... ");
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logprintf(logdepth, "find_vsnprintf: trying to find vsnprintf...\n");
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logdepth++;
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logprintf(logdepth, "trying vsnprintf...\n");
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if ((compile_run(logdepth+1, test_c, NULL, NULL, NULL, &out) == 0) && (strcmp(out, "OK"))) {
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put("libs/vsnprintf", strue);
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report("found\n");
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free(out);
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return 0;
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}
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put("libs/vsnprintf", sfalse);
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report("not found\n");
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return 1;
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}
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