mingw32: implement system(3) call using sh instead of cmd.exe

2 files changed, 80 insertions, 0 deletions

diff --git a/include/mingw.h b/include/mingw.h
index a9b14a9b2..08d776c84 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -169,6 +169,9 @@ int winansi_get_terminal_width_height(struct winsize *win);
 #define WTERMSIG(x) ((x) & 0x7f)
 #define WCOREDUMP(x) 0
 
+int mingw_system(const char *cmd);
+#define system mingw_system
+
 int clearenv(void);
 char *mingw_getenv(const char *name);
 int mkstemp(char *template);
diff --git a/win32/system.c b/win32/system.c
new file mode 100644
index 000000000..5a56173ec
--- /dev/null
+++ b/win32/system.c
@@ -0,0 +1,77 @@
+#include "libbb.h"
+
+int mingw_system(const char *cmd)
+{
+        STARTUPINFO siStartInfo;
+        PROCESS_INFORMATION piProcInfo;
+        int success;
+        int len, count;
+        char *cmd_buff = NULL;
+        const char *s;
+        char *t;
+        DWORD ret;
+
+        if ( cmd == NULL ) {
+                return 1;
+        }
+
+        /* count double quotes */
+        count = 0;
+        for ( s=cmd; *s; ++s ) {
+                if ( *s == '"' ) {
+                        ++count;
+                }
+        }
+
+        len = strlen(cmd) + 10 + count;
+        if ( (cmd_buff=malloc(len)) == NULL ) {
+                return -1;
+        }
+
+        /* escape double quotes */
+        strcpy(cmd_buff, "sh -c \"");
+        for ( s=cmd,t=cmd_buff+strlen(cmd_buff); *s; ++s ) {
+                if ( *s == '"' ) {
+                        *t++ = '\\';
+                }
+                *t++ = *s;
+        }
+        *t++ = '"';
+        *t = '\0';
+
+        /* Now create the child process */
+        ZeroMemory(&siStartInfo, sizeof(STARTUPINFO));
+        siStartInfo.cb           = sizeof(STARTUPINFO);
+        siStartInfo.hStdInput    = GetStdHandle(STD_INPUT_HANDLE);
+        siStartInfo.hStdOutput   = GetStdHandle(STD_OUTPUT_HANDLE);
+        siStartInfo.hStdError    = GetStdHandle(STD_ERROR_HANDLE);
+        siStartInfo.dwFlags      = STARTF_USESTDHANDLES;
+
+        success = CreateProcess(NULL,
+                                (LPTSTR)cmd_buff,  /* command line */
+                                NULL,              /* process security attributes */
+                                NULL,              /* primary thread security attributes */
+                                TRUE,              /* handles are inherited */
+                                0,                 /* creation flags */
+                                NULL,              /* use parent's environment */
+                                NULL,              /* use parent's current directory */
+                                &siStartInfo,      /* STARTUPINFO pointer */
+                                &piProcInfo);      /* receives PROCESS_INFORMATION */
+
+        if ( !success ) {
+                free(cmd_buff);
+                return 127;
+        }
+
+        free(cmd_buff);
+
+        WaitForSingleObject(piProcInfo.hProcess, INFINITE);
+
+        ret = 0;
+        GetExitCodeProcess(piProcInfo.hProcess, &ret);
+
+        CloseHandle(piProcInfo.hProcess);
+        CloseHandle(piProcInfo.hThread);
+
+        return WEXITSTATUS(ret);
+}