78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
#define _POSIX_C_SOURCE 200809L
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "ruby-runner.h"
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#define STRINGIZE(expr) STRINGIZE0(expr)
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#define STRINGIZE0(expr) #expr
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static void
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insert_env_path(const char *envname, const char *paths, size_t size, int prepend)
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{
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const char *env = getenv(envname);
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char c = 0;
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size_t n = 0;
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if (env) {
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while ((c = *env) == PATH_SEP) ++env;
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n = strlen(env);
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while (n > 0 && env[n-1] == PATH_SEP) --n;
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}
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if (c) {
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char *e = malloc(size+n+1);
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size_t pos = 0;
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if (prepend) {
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memcpy(e, paths, pos = size-1);
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e[pos++] = PATH_SEP;
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}
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memcpy(e+pos, env, n);
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pos += n;
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if (!prepend) {
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e[pos++] = PATH_SEP;
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memcpy(e+pos, paths, size-1);
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pos += size-1;
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}
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e[pos] = '\0';
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env = e;
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}
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else {
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env = paths;
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}
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setenv(envname, env, 1);
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}
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#define EXTOUT_DIR BUILDDIR"/"EXTOUT
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int
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main(int argc, char **argv)
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{
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static const char builddir[] = BUILDDIR;
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static const char rubypath[] = BUILDDIR"/"STRINGIZE(RUBY_INSTALL_NAME);
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static const char rubylib[] =
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ABS_SRCDIR"/lib"
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PATH_SEPARATOR
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EXTOUT_DIR"/common"
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PATH_SEPARATOR
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EXTOUT_DIR"/"ARCH
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;
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const size_t dirsize = sizeof(builddir);
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const size_t namesize = sizeof(rubypath) - dirsize;
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const char *rubyname = rubypath + dirsize;
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char *arg0 = argv[0], *p;
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insert_env_path(LIBPATHENV, builddir, dirsize, 1);
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insert_env_path("RUBYLIB", rubylib, sizeof(rubylib), 0);
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if (!(p = strrchr(arg0, '/'))) p = arg0; else p++;
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if (strlen(p) < namesize - 1) {
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argv[0] = malloc(p - arg0 + namesize);
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memcpy(argv[0], arg0, p - arg0);
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p = argv[0] + (p - arg0);
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}
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memcpy(p, rubyname, namesize);
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execv(rubypath, argv);
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return -1;
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}
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