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Bootstrap program_invocation_name.

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This commit is contained in:
Jonas 'Sortie' Termansen 2013-03-20 22:57:49 +01:00
parent 1e20b0e7ec
commit 915169bdae
1 changed files with 13 additions and 5 deletions
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18
libc/init.cpp
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@ -26,8 +26,7 @@
#include <malloc.h>
#include <string.h>
extern "C" { char program_invocation_name_data[256] = ""; }
extern "C" { char* program_invocation_name = program_invocation_name_data; }
extern "C" { char* program_invocation_name; }
extern "C" { char* program_invocation_short_name; }
extern "C" void init_error_functions();
@ -45,9 +44,14 @@ static char* find_last_elem(char* str)
extern "C" void initialize_standard_library(int argc, char* argv[])
{
if ( argc )
strcpy(program_invocation_name, argv[0]);
program_invocation_short_name = find_last_elem(program_invocation_name);
// We got ourselves a little bootstrap problem. We'd like these variables to
// be available during early startup - however, we can't create a copy yet
// because the heap isn't initialized yet. Instead, we'll simply point at
// the original value - we're safe since argv[0] is not supposed to be
// modified until main is run. Once we heap is up, we'll strdup.
const char* argv0 = argc ? argv[0] : "";
program_invocation_name = (char*) argv0;
program_invocation_short_name = find_last_elem((char*) argv0);
// Initialize stuff such as errno.
init_error_functions();
@ -60,4 +64,8 @@ extern "C" void initialize_standard_library(int argc, char* argv[])
// Initialize stdio.
init_stdio();
// We can now create a copy of the program name variables safely.
program_invocation_name = strdup(program_invocation_name);
program_invocation_short_name = find_last_elem(program_invocation_name);
}