mirror of
https://github.com/switchbrew/libnx.git
synced 2025-06-21 20:42:44 +02:00
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
#include <switch.h>
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#include <string.h>
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#include <ctype.h>
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// System globals we define here
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int __system_argc;
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char** __system_argv;
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extern char* fake_heap_start;
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extern char* fake_heap_end;
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extern u32 __argdata__;
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void argvSetup(void)
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{
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Result rc=0;
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MemoryInfo meminfo;
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u32 pageinfo=0;
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u8 *argdata = (u8*)&__argdata__;
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u32 *arg32 = (u32*)argdata;
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u32 argdata_allocsize;
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u32 argdata_strsize;
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u32 argvptr_pos;
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u32 max_argv;
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u32 argi;
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u32 arglen=0;
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bool quote_flag=0;
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bool end_flag=0;
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char *args;
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char *argstart;
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char *argstorage;
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__system_argc = 0;
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__system_argv = NULL;
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rc = svcQueryMemory(&meminfo, &pageinfo, (u64)argdata);
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// TODO: Use envHasArgv() here.
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// This memory is only mapped when arguments were passed.
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if (R_FAILED(rc) || meminfo.perm != 0x3)
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return;
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argdata_allocsize = arg32[0];
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argdata_strsize = arg32[1];
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args = (char*)&argdata[0x20];
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if (argdata_allocsize==0 || argdata_strsize==0) return;
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argvptr_pos = 0x20 + argdata_strsize+1;
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if (argvptr_pos >= argdata_allocsize) return;
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argstorage = (char*)&argdata[argvptr_pos];
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argvptr_pos += (argdata_strsize+1 + 0x9) & ~0x7;
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if (argvptr_pos >= argdata_allocsize) return;
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max_argv = (argdata_allocsize - argvptr_pos) >> 3;
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if (max_argv < 2) return;
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__system_argv = (char**)&argdata[argvptr_pos];
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argstart = NULL;
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for(argi=0; argi<argdata_strsize; argi++) {
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if (argstart == NULL && isspace(args[argi])) continue;
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if (argstart == NULL) {
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if (args[argi] == '"') {
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argstart = &args[argi+1];
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quote_flag = 1;
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}
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else if(args[argi]!=0) {
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argstart = &args[argi];
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arglen++;
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}
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}
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else {
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end_flag = 0;
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if (quote_flag && args[argi] == '"') {
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end_flag = 1;
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}
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else if (isspace(args[argi])) {
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end_flag = 1;
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}
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else if(args[argi]!=0) {
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arglen++;
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}
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if ((args[argi]==0 || end_flag) && arglen) {
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strncpy(argstorage, argstart, arglen);
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argstorage[arglen] = 0;
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__system_argv[__system_argc] = argstorage;
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__system_argc++;
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argstart = NULL;
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quote_flag = 0;
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argstorage+= arglen+1;
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arglen = 0;
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if (__system_argc >= max_argv) break;
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}
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}
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}
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if (arglen && __system_argc < max_argv) {
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strncpy(argstorage, argstart, arglen);
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argstorage[arglen] = 0;
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__system_argv[__system_argc] = argstorage;
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__system_argc++;
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}
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__system_argv[__system_argc] = NULL;
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}
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