1 files changed, 112 insertions, 0 deletions
diff --git a/atari/system.c b/atari/system.c
new file mode 100644
index 00000000..26943bb4
--- /dev/null
+++ b/atari/system.c
@@ -0,0 +1,112 @@
+/*
+ * function system() - slightly modified from sources dLibs 1.2
+ * - a freely distributable C library for Atari ST.
+ * Authors: Dale Schumacher and John Stanley, I believe.
+ * Changes for gcc compiler and gnulib.olb - Michal Jaegermann
+ */
+
+#include <osbind.h>
+#include <stdio.h>
+#include <string.h>
+#include <basepage.h>
+#ifdef __GNUC__
+#include <process.h>
+#define ERROR 2
+#endif
+
+/* #define DEBUG  */
+#ifdef DEBUG
+#define _COOKIE(x) puts(x);putchar('\n')
+#endif
+
+void static
+parse_args(char *cmdln, register char **argv)
+{
+	register char *p;
+	static char delim[] = " \t\r\n";
+
+	if(p = strtok(cmdln, delim)) {
+		do {
+			*argv++ = p;
+		} while(p = strtok(NULL, delim));
+	}
+}
+
+#ifdef __GNUC__
+/* this is used by assembler statement to keep a copy of registers */
+static volatile long savearea[16];
+#endif
+
+int
+system(const char *command)
+{
+	register char *p;
+	register int (*shell)();
+#ifndef __GNUC__
+	char rv[2];
+#endif
+	char cmdln[1024];
+	char *args[64];
+	char *getenv();
+
+	if(!command)
+		return(ERROR);
+
+	/* get _shell_p value */
+	p = (char *) Super(0L);  /* supervisor mode */
+	shell = (int (*)()) *((long *) 0x4F6L);
+	(void) Super(p);	 /* restore user mode */
+
+	/* validate _shell_p */
+	if((shell) &&				/* Shell available. */
+	   (((long) shell) < ((long) _base)) &&	/* Reasonable shell pointer. */
+	   (strncmp((char *)shell, "PATH", 4)))	/* Not corrupted */
+		{
+#ifdef __GNUC__
+		int ret;
+#endif
+		/* execute the command */
+#ifdef DEBUG
+_COOKIE("system: using _shell_p");
+printf("'shell' got value 0x%08lx\n", (long)shell);
+#endif
+/* a bit of paranoia caused by some misbehaving programs */
+#ifdef __GNUC__
+asm("moveml d1-d7/a0-a7,_savearea");	
+		ret = (*shell)(command);
+asm("moveml _savearea,d1-d7/a0-a7");
+		return (ret);
+#else
+		return ((*shell)(command));
+#endif
+		}
+
+	strcpy(cmdln, command);	/* copy the command line for parsing */
+
+	if((p = getenv("SHELL")) && (*p))	/* SHELL= variable? */
+		{
+		args[0] = p;
+		parse_args(cmdln, (args + 1));
+#ifdef DEBUG
+_COOKIE("system: executing SHELL");
+_COOKIE(p);
+#endif
+		}
+	else	/* attempt to find first token as a program on the path */
+		{
+		parse_args(cmdln, args);
+		p = args[0];
+#ifdef DEBUG
+_COOKIE("system: directly executing program");
+_COOKIE(p);
+#endif
+		}
+
+#ifdef __GNUC__
+	return(spawnvp(0, p, args));
+#else   /* original from dLibs */
+	forkvpe(p, args, NULL);
+	wait(rv);
+	return((rv[1] == 0) ? rv[0] : rv[1]);
+#endif
+}