зеркало из https://github.com/github/ruby.git
50 строки
1.2 KiB
C
50 строки
1.2 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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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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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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const char *libpath = getenv(LIBPATHENV);
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char c = 0;
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if (libpath) {
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while ((c = *libpath) == PATH_SEP) ++libpath;
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}
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if (c) {
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size_t n = strlen(libpath);
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char *e = malloc(dirsize+n+1);
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memcpy(e, builddir, dirsize-1);
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e[dirsize-1] = PATH_SEP;
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memcpy(e+dirsize, libpath, n+1);
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libpath = e;
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}
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else {
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libpath = builddir;
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}
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setenv(LIBPATHENV, libpath, 1);
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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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