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#define _XOPEN_SOURCE 500
#define _POSIX_C_SOURCE 200112L
/**
* Primary entry point for calp.
*
* This is a C file, rather than a shellscript for 2 reasons:
* 1. It makes the binary show up with the proper name in process
* listings
* 2. Guile's default command line handling leaves a lot to be
* desired.
*
* The following pre-processor variables are checked during compilation:
*
* BUILD_ENV
* If defined then the environment is fetched from where the file
* resides. This is for development when all dependencies are in the
* repo alongside this file.
* MAIN_MODULE
* Guile module containing the programs entry point. Note that it
* should be given without parenthesis.
*
* Defaults to "calp main"
* MAIN_PROC
* Procedure within the MAIN_MODULE which is the programs entry
* point.
*
* Default to "main"
*
* During runtime, the environment variable "__PRINT_ENVIRONMENT" is
* checked, and if its set then a environment variables suitable for
* guile is printed instead of running anything. This is mainly used
* by the test runners.
*
* Parts of this file is noted as being "borrowed from Guile". Guile
* is covered under LGPL3, this file is covered under AGPL, which
* means it is ok.
*/
#ifndef MAIN_MODULE
#define MAIN_MODULE "calp main"
#endif
#ifndef MAIN_PROC
#define MAIN_PROC "main"
#endif
#include <libgen.h>
#include <libguile.h>
#include <string.h>
#include <stdio.h>
#include <locale.h>
#include <errno.h>
#include <limits.h>
/** Definitions to ensure each instance is correctly spelled below */
#define GUILE_LOAD_PATH "GUILE_LOAD_PATH"
#define GUILE_LOAD_COMPILED_PATH "GUILE_LOAD_COMPILED_PATH"
#define GUILE_AUTO_COMPILE "GUILE_AUTO_COMPILE"
#define PRINT_ENVIRONMENT "__PRINT_ENVIRONMENT"
/** Borrowed from Guile 3.0.9 libguile/guile.c */
static int
get_integer_from_environment (const char *var, int def)
{
char *end = 0;
char *val = getenv (var);
long res = def;
if (!val)
return def;
res = strtol (val, &end, 10);
if (end == val)
{
fprintf (stderr, "guile: warning: invalid %s: %s\n", var, val);
return def;
}
return res;
}
static void inner_main (void *closure, int argc, char **argv) {
SCM main = scm_c_public_ref(MAIN_MODULE, MAIN_PROC);
SCM scm_args = scm_c_make_vector (argc, SCM_UNDEFINED);
for (size_t i = 0; i < (size_t) argc; i++) {
scm_c_vector_set_x (scm_args, i, scm_from_locale_string(argv[i]));
}
scm_call_1(main, scm_vector_to_list(scm_args));
}
/** Procedure marked unused since GCC dosen't understand function
* pointers when checking usage */
__attribute__((__unused__))
static void *get_guile_version (void *data) {
(void) data;
return scm_to_locale_string(scm_version());
}
static void export (const char *key, const char *val) {
printf("export %s=%s;\n", key, val);
}
int main(int argc, char *argv[]) {
/* Locale initialization code borrowed from Guile 3.0.9 libguile/guile.c */
if (get_integer_from_environment("GUILE_INSTALL_LOCALE", 1) && setlocale(LC_ALL, "") == NULL) {
fprintf(stderr, "calp: warning: failed to install locale\n");
}
#ifdef BUILD_ENV
char *bin_path = realpath(argv[0], NULL);
if (bin_path == NULL) {
fprintf(stderr, "%s\n", strerror(errno));
return 1;
}
char *here = dirname(bin_path);
{
const char *load_path = getenv(GUILE_LOAD_PATH);
size_t len = PATH_MAX + strlen("module") + 1;
if (load_path) len += strlen(load_path);
char *buf = malloc(len);
if (load_path) {
sprintf(buf, "%s:%s/module", load_path, here);
} else {
sprintf(buf, "%s/module", here);
}
setenv(GUILE_LOAD_PATH, buf, 1);
free(buf);
}
{
char *version = scm_with_guile(&get_guile_version, NULL);
const char *load_path = getenv(GUILE_LOAD_COMPILED_PATH);
size_t len = PATH_MAX + strlen("module") + strlen(version) + 1;
if (load_path) len += strlen(load_path);
char *buf = malloc(len);
if (load_path) {
sprintf(buf, "%s:%s/obj-%s", load_path, here, version);
} else {
sprintf(buf, "%s/obj-%s", here, version);
}
setenv(GUILE_LOAD_COMPILED_PATH, buf, 1);
free(buf);
free(version);
}
setenv(GUILE_AUTO_COMPILE, "0", 1);
free(bin_path);
#endif
if (getenv(PRINT_ENVIRONMENT)) {
export(GUILE_LOAD_PATH, getenv(GUILE_LOAD_PATH));
export(GUILE_LOAD_COMPILED_PATH, getenv(GUILE_LOAD_COMPILED_PATH));
export(GUILE_AUTO_COMPILE, "0");
export("GUILE", "${GUILE:-guile}");
export("CALP_TEST_ENVIRONMENT", "1");
return 0;
}
scm_boot_guile (argc, argv, inner_main, 0);
return 0; /* never reacher */
}
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