#define _POSIX_C_SOURCE 200809L
#define EXIT_BAD_USAGE 1
#define EXIT_TROUBLE_RUNNING 2
#define EXIT_BAD_TEST 3
#define EXIT_BAD_INPUT 4
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#ifdef _MSC_VER
#define sleep Sleep
#else
#include <unistd.h>
#endif
#ifdef _MSC_VER
#define popen _popen
#define pclose _pclose
#endif
#ifdef _MSC_VER
#define DEFAULT_COMPILER "cl"
#define DEFAULT_FLAGS "-nologo -Zi -W4 -wd4200 " \
"-D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS"
#define DEFAULT_OUTPUT_EXE_FLAG "-Fe:"
#else
#define DEFAULT_COMPILER "cc"
#define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
#define DEFAULT_OUTPUT_EXE_FLAG "-o"
#endif
#define OUTPUT_FILE "configurator.out"
#define INPUT_FILE "configuratortest.c"
#ifdef _WIN32
#define DIR_SEP "\\"
#else
#define DIR_SEP "/"
#endif
static const char *progname = "";
static int verbose;
static bool like_a_libtool = false;
struct test {
const char *name;
const char *desc;
const char *style;
const char *depends;
const char *link;
const char *fragment;
const char *flags;
const char *overrides;
bool done;
bool answer;
};
static struct test *tests;
static const struct test base_tests[] = {
{ "HAVE_UNALIGNED_ACCESS", "unaligned access to int",
"DEFINES_EVERYTHING|EXECUTE", NULL, NULL,
"#include <string.h>\n"
"int main(int argc, char *argv[]) {\n"
" (void)argc;\n"
" char pad[sizeof(int *) * 1];\n"
" memcpy(pad, argv[0], sizeof(pad));\n"
" int *x = (int *)pad, *y = (int *)(pad + 1);\n"
" return *x == *y;\n"
"}\n" },
{ "HAVE_TYPEOF", "__typeof__ support",
"INSIDE_MAIN", NULL, NULL,
"__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
{ "HAVE_BIG_ENDIAN", "big endian",
"INSIDE_MAIN|EXECUTE", NULL, NULL,
"union { int i; char c[sizeof(int)]; } u;\n"
"u.i = 0x01020304;\n"
"return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
{ "HAVE_BYTESWAP_H", "<byteswap.h>",
"OUTSIDE_MAIN", NULL, NULL,
"#include <byteswap.h>\n" },
{ "HAVE_BSWAP_64", "bswap64 in byteswap.h",
"DEFINES_FUNC", "HAVE_BYTESWAP_H", NULL,
"#include <byteswap.h>\n"
"static int func(int x) { return bswap_64(x); }" },
{ "HAVE_LITTLE_ENDIAN", "little endian",
"INSIDE_MAIN|EXECUTE", NULL, NULL,
"union { int i; char c[sizeof(int)]; } u;\n"
"u.i = 0x01020304;\n"
"return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
};
static void c12r_err(int eval, const char *fmt, ...)
{
int err_errno = errno;
va_list ap;
fprintf(stderr, "%s: ", progname);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, ": %s\n", strerror(err_errno));
exit(eval);
}
static void c12r_errx(int eval, const char *fmt, ...)
{
va_list ap;
fprintf(stderr, "%s: ", progname);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
exit(eval);
}
static void start_test(const char *what, const char *why)
{
if (like_a_libtool) {
printf("%s%s... ", what, why);
fflush(stdout);
}
}
static void end_test(bool result)
{
if (like_a_libtool)
printf("%s\n", result ? "yes" : "no");
}
static size_t fcopy(FILE *fsrc, FILE *fdst)
{
char buffer[BUFSIZ];
size_t rsize, wsize;
size_t copied = 0;
while ((rsize = fread(buffer, 1, BUFSIZ, fsrc)) > 0) {
wsize = fwrite(buffer, 1, rsize, fdst);
copied += wsize;
if (wsize != rsize)
break;
}
return copied;
}
static char *grab_stream(FILE *file)
{
size_t max, ret, size = 0;
char *buffer;
max = BUFSIZ;
buffer = malloc(max);
while ((ret = fread(buffer+size, 1, max - size, file)) == max - size) {
size += ret;
buffer = realloc(buffer, max *= 2);
}
size += ret;
if (ferror(file))
c12r_err(EXIT_TROUBLE_RUNNING, "reading from command");
buffer[size] = '\0';
return buffer;
}
static char *run(const char *cmd, int *exitstatus)
{
static const char redir[] = " 2>&1";
size_t cmdlen;
char *cmdredir;
FILE *cmdout;
char *ret;
cmdlen = strlen(cmd);
cmdredir = malloc(cmdlen + sizeof(redir));
memcpy(cmdredir, cmd, cmdlen);
memcpy(cmdredir + cmdlen, redir, sizeof(redir));
cmdout = popen(cmdredir, "r");
if (!cmdout)
c12r_err(EXIT_TROUBLE_RUNNING, "popen \"%s\"", cmdredir);
free(cmdredir);
ret = grab_stream(cmdout);
*exitstatus = pclose(cmdout);
return ret;
}
static char *connect_args(const char *argv[], const char *outflag,
const char *files)
{
unsigned int i;
char *ret;
size_t len = strlen(outflag) + strlen(files) + 1;
for (i = 1; argv[i]; i++)
len += 1 + strlen(argv[i]);
ret = malloc(len);
len = 0;
for (i = 1; argv[i]; i++) {
strcpy(ret + len, argv[i]);
len += strlen(argv[i]);
if (argv[i+1] || *outflag)
ret[len++] = ' ';
}
strcpy(ret + len, outflag);
len += strlen(outflag);
strcpy(ret + len, files);
return ret;
}
static struct test *find_test(const char *name)
{
unsigned int i;
for (i = 0; tests[i].name; i++) {
if (strcmp(tests[i].name, name) == 0)
return &tests[i];
}
c12r_errx(EXIT_BAD_TEST, "Unknown test %s", name);
abort();
}
#define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
#define MAIN_START_BOILERPLATE \
"int main(int argc, char *argv[]) {\n" \
" (void)argc;\n" \
" (void)argv;\n"
#define USE_FUNC_BOILERPLATE "(void)func;\n"
#define MAIN_BODY_BOILERPLATE "return 0;\n"
#define MAIN_END_BOILERPLATE "}\n"
static bool run_test(const char *cmd, const char *wrapper, struct test *test)
{
char *output, *newcmd;
FILE *outf;
int status;
if (test->done)
return test->answer;
if (test->depends) {
size_t len;
const char *deps = test->depends;
char *dep;
while ((len = strcspn(deps, " ")) != 0) {
bool positive = true;
if (deps[len]) {
dep = strdup(deps);
dep[len] = '\0';
} else {
dep = (char *)deps;
}
if (dep[0] == '!') {
dep++;
positive = false;
}
if (run_test(cmd, wrapper, find_test(dep)) != positive) {
test->answer = false;
test->done = true;
return test->answer;
}
if (deps[len])
free(dep);
deps += len;
deps += strspn(deps, " ");
}
}
outf = fopen(INPUT_FILE, verbose > 1 ? "w+" : "w");
if (!outf)
c12r_err(EXIT_TROUBLE_RUNNING, "creating %s", INPUT_FILE);
fprintf(outf, "%s", PRE_BOILERPLATE);
if (strstr(test->style, "INSIDE_MAIN")) {
fprintf(outf, "%s", MAIN_START_BOILERPLATE);
fprintf(outf, "%s", test->fragment);
fprintf(outf, "%s", MAIN_END_BOILERPLATE);
} else if (strstr(test->style, "OUTSIDE_MAIN")) {
fprintf(outf, "%s", test->fragment);
fprintf(outf, "%s", MAIN_START_BOILERPLATE);
fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
fprintf(outf, "%s", MAIN_END_BOILERPLATE);
} else if (strstr(test->style, "DEFINES_FUNC")) {
fprintf(outf, "%s", test->fragment);
fprintf(outf, "%s", MAIN_START_BOILERPLATE);
fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
fprintf(outf, "%s", MAIN_END_BOILERPLATE);
} else if (strstr(test->style, "DEFINES_EVERYTHING")) {
fprintf(outf, "%s", test->fragment);
} else
c12r_errx(EXIT_BAD_TEST, "Unknown style for test %s: %s",
test->name, test->style);
if (verbose > 1) {
fseek(outf, 0, SEEK_SET);
fcopy(outf, stdout);
}
fclose(outf);
newcmd = strdup(cmd);
if (test->flags) {
newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
+ strlen(test->flags) + 1);
strcat(newcmd, " ");
strcat(newcmd, test->flags);
if (verbose > 1)
printf("Extra flags line: %s", newcmd);
}
if (test->link) {
newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
+ strlen(test->link) + 1);
strcat(newcmd, " ");
strcat(newcmd, test->link);
if (verbose > 1)
printf("Extra link line: %s", newcmd);
}
start_test("checking for ", test->desc);
output = run(newcmd, &status);
free(newcmd);
if (status != 0 || strstr(output, "warning")) {
if (verbose)
printf("Compile %s for %s, status %i: %s\n",
status ? "fail" : "warning",
test->name, status, output);
if (strstr(test->style, "EXECUTE")
&& !strstr(test->style, "MAY_NOT_COMPILE"))
c12r_errx(EXIT_BAD_TEST,
"Test for %s did not compile:\n%s",
test->name, output);
test->answer = false;
free(output);
} else {
free(output);
if (strstr(test->style, "EXECUTE")
|| strstr(test->style, "INSIDE_MAIN")) {
char *cmd = malloc(strlen(wrapper) + strlen(" ." DIR_SEP OUTPUT_FILE) + 1);
strcpy(cmd, wrapper);
strcat(cmd, " ." DIR_SEP OUTPUT_FILE);
output = run(cmd, &status);
free(cmd);
if (!strstr(test->style, "EXECUTE") && status != 0)
c12r_errx(EXIT_BAD_TEST,
"Test for %s failed with %i:\n%s",
test->name, status, output);
if (verbose && status)
printf("%s exited %i\n", test->name, status);
free(output);
}
test->answer = (status == 0);
}
test->done = true;
end_test(test->answer);
if (test->answer && test->overrides) {
struct test *override = find_test(test->overrides);
override->done = true;
override->answer = true;
}
return test->answer;
}
static char *any_field(char **fieldname)
{
char buf[1000];
for (;;) {
char *p, *eq;
if (!fgets(buf, sizeof(buf), stdin))
return NULL;
p = buf;
while (*p == ' ' || *p == '\t')
p++;
if (*p == '#' || *p == '\n')
continue;
eq = strchr(p, '=');
if (!eq)
c12r_errx(EXIT_BAD_INPUT, "no = in line: %s", p);
*eq = '\0';
*fieldname = strdup(p);
p = eq + 1;
if (strlen(p) && p[strlen(p)-1] == '\n')
p[strlen(p)-1] = '\0';
return strdup(p);
}
}
static char *read_field(const char *name, bool compulsory)
{
char *fieldname, *value;
value = any_field(&fieldname);
if (!value) {
if (!compulsory)
return NULL;
c12r_errx(EXIT_BAD_INPUT, "Could not read field %s", name);
}
if (strcmp(fieldname, name) != 0)
c12r_errx(EXIT_BAD_INPUT,
"Expected field %s not %s", name, fieldname);
return value;
}
static bool read_test(struct test *test)
{
char *field, *value;
char buf[1000];
memset(test, 0, sizeof(*test));
test->name = read_field("var", false);
if (!test->name)
return false;
test->desc = read_field("desc", true);
test->style = read_field("style", true);
while ((value = any_field(&field)) != NULL) {
if (strcmp(field, "depends") == 0)
test->depends = value;
else if (strcmp(field, "link") == 0)
test->link = value;
else if (strcmp(field, "flags") == 0)
test->flags = value;
else if (strcmp(field, "overrides") == 0)
test->overrides = value;
else if (strcmp(field, "code") == 0)
break;
else
c12r_errx(EXIT_BAD_INPUT, "Unknown field %s in %s",
field, test->name);
}
if (!value)
c12r_errx(EXIT_BAD_INPUT, "Missing code in %s", test->name);
if (strlen(value) == 0) {
while (fgets(buf, sizeof(buf), stdin) != 0) {
size_t n;
if (strncmp(buf, "/*END*/", 7) == 0)
break;
n = strlen(value);
value = realloc(value, n + strlen(buf) + 1);
strcpy(value + n, buf);
n += strlen(buf);
}
}
test->fragment = value;
return true;
}
static void read_tests(size_t num_tests)
{
while (read_test(tests + num_tests)) {
num_tests++;
tests = realloc(tests, (num_tests + 1) * sizeof(tests[0]));
tests[num_tests].name = NULL;
}
}
int main(int argc, const char *argv[])
{
char *cmd;
unsigned int i;
const char *default_args[]
= { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
const char *outflag = DEFAULT_OUTPUT_EXE_FLAG;
const char *configurator_cc = NULL;
const char *wrapper = "";
const char *orig_cc;
const char *varfile = NULL;
const char *headerfile = NULL;
bool extra_tests = false;
FILE *outf;
if (argc > 0)
progname = argv[0];
while (argc > 1) {
if (strcmp(argv[1], "--help") == 0) {
printf("Usage: configurator [-v] [--var-file=<filename>] [-O<outflag>] [--configurator-cc=<compiler-for-tests>] [--wrapper=<wrapper-for-tests>] [--autotools-style] [--extra-tests] [<compiler> <flags>...]\n"
" <compiler> <flags> will have \"<outflag> <outfile> <infile.c>\" appended\n"
"Default: %s %s %s\n",
DEFAULT_COMPILER, DEFAULT_FLAGS,
DEFAULT_OUTPUT_EXE_FLAG);
exit(0);
}
if (strncmp(argv[1], "-O", 2) == 0) {
argc--;
argv++;
outflag = argv[1] + 2;
if (!*outflag) {
fprintf(stderr,
"%s: option requires an argument -- O\n",
argv[0]);
exit(EXIT_BAD_USAGE);
}
} else if (strcmp(argv[1], "-v") == 0) {
argc--;
argv++;
verbose++;
} else if (strcmp(argv[1], "-vv") == 0) {
argc--;
argv++;
verbose += 2;
} else if (strncmp(argv[1], "--configurator-cc=", 18) == 0) {
configurator_cc = argv[1] + 18;
argc--;
argv++;
} else if (strncmp(argv[1], "--wrapper=", 10) == 0) {
wrapper = argv[1] + 10;
argc--;
argv++;
} else if (strncmp(argv[1], "--var-file=", 11) == 0) {
varfile = argv[1] + 11;
argc--;
argv++;
} else if (strcmp(argv[1], "--autotools-style") == 0) {
like_a_libtool = true;
argc--;
argv++;
} else if (strncmp(argv[1], "--header-file=", 14) == 0) {
headerfile = argv[1] + 14;
argc--;
argv++;
} else if (strcmp(argv[1], "--extra-tests") == 0) {
extra_tests = true;
argc--;
argv++;
} else if (strcmp(argv[1], "--") == 0) {
break;
} else if (argv[1][0] == '-') {
c12r_errx(EXIT_BAD_USAGE, "Unknown option %s", argv[1]);
} else {
break;
}
}
if (argc == 1)
argv = default_args;
tests = calloc(sizeof(base_tests)/sizeof(base_tests[0]) + 1,
sizeof(base_tests[0]));
memcpy(tests, base_tests, sizeof(base_tests));
if (extra_tests)
read_tests(sizeof(base_tests)/sizeof(base_tests[0]));
orig_cc = argv[1];
if (configurator_cc)
argv[1] = configurator_cc;
cmd = connect_args(argv, outflag, OUTPUT_FILE " " INPUT_FILE);
if (like_a_libtool) {
start_test("Making autoconf users comfortable", "");
sleep(1);
end_test(1);
}
for (i = 0; tests[i].name; i++)
run_test(cmd, wrapper, &tests[i]);
free(cmd);
remove(OUTPUT_FILE);
remove(INPUT_FILE);
if (varfile) {
FILE *vars;
if (strcmp(varfile, "-") == 0)
vars = stdout;
else {
start_test("Writing variables to ", varfile);
vars = fopen(varfile, "a");
if (!vars)
c12r_err(EXIT_TROUBLE_RUNNING,
"Could not open %s", varfile);
}
for (i = 0; tests[i].name; i++)
fprintf(vars, "%s=%u\n", tests[i].name, tests[i].answer);
if (vars != stdout) {
if (fclose(vars) != 0)
c12r_err(EXIT_TROUBLE_RUNNING,
"Closing %s", varfile);
end_test(1);
}
}
if (headerfile) {
start_test("Writing header to ", headerfile);
outf = fopen(headerfile, "w");
if (!outf)
c12r_err(EXIT_TROUBLE_RUNNING,
"Could not open %s", headerfile);
} else
outf = stdout;
fprintf(outf, "/* Generated by CCAN configurator */\n"
"#ifndef CCAN_CONFIG_H\n"
"#define CCAN_CONFIG_H\n");
fprintf(outf, "#ifndef _GNU_SOURCE\n");
fprintf(outf, "#define _GNU_SOURCE /* Always use GNU extensions. */\n");
fprintf(outf, "#endif\n");
fprintf(outf, "#define CCAN_COMPILER \"%s\"\n", orig_cc);
cmd = connect_args(argv + 1, "", "");
fprintf(outf, "#define CCAN_CFLAGS \"%s\"\n", cmd);
free(cmd);
fprintf(outf, "#define CCAN_OUTPUT_EXE_CFLAG \"%s\"\n\n", outflag);
fprintf(outf, "#define HAVE_CCAN 1\n");
for (i = 0; tests[i].name; i++)
fprintf(outf, "#define %s %u\n", tests[i].name, tests[i].answer);
fprintf(outf, "#endif /* CCAN_CONFIG_H */\n");
if (headerfile) {
if (fclose(outf) != 0)
c12r_err(EXIT_TROUBLE_RUNNING, "Closing %s", headerfile);
end_test(1);
}
return 0;
}