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