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CPM OPERATING SYSTEMS/CPM 68K/1.0X SOURCES/v102a/clib/exec.c

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+/***************************************************************************
+ *									    
+ *			    E x e c   F u n c t i o n			    
+ *			    -------------------------			    
+ *	Copyright 1982 by Digital Research Inc.  All rights reserved.	    
+ *									    
+ *	The execl function is called from anywhere to pass control to  	    
+ *	another program from the the executing C program.		    
+ *	Note that the stream files are closed via '_cleanup()'.		    
+ *									    
+ *	Calling Sequence:						    
+ *									    
+ *		execl(name,arg0,arg1,...,argn,NULLPTR);			    
+ *									    
+ *	Where:								    
+ *		name, arg0, arg1...argn are pointers to character strings   
+ *									    
+ ****************************************************************************/
+#include "portab.h"
+#include "osif.h"
+#include "osiferr.h"
+#include "errno.h"
+#include "ctype.h"
+
+UWORD	execl(name,arg0)			/* CLEAR FUNCTION ***********/
+	UBYTE *name,*arg0;			/* pointers arguments      */
+{						/*			   */
+  REG	UBYTE **args;				/* used to index into args */
+	UBYTE cmdline[128];			/* CP/M command line area  */
+  REG	WORD  i;				/***************************/
+						/*			   */
+	_cleanup();				/* Close all (stream) files*/
+						/* now build cmdline 	   */
+	strcpy(cmdline,name);			/* Copy name portion	   */
+#if PCDOS == 0					/* Don't do for PCDOS	   */
+	for(i = strlen(cmdline); --i >= 0; )	/* uppercase command name  */
+	  cmdline[i] = toupper(cmdline[i]);	/*			   */
+#endif						/***************************/
+	args = &arg0;				/* Copy args		   */
+	args++;					/* arg0 is a dup of the    */
+						/*	      command name */
+	while(*args != NULLPTR)			/***************************/
+	  {					/*			   */
+            strcat(cmdline," ");		/* Add a blank		   */
+	    strcat(cmdline,*args++);		/* Add next arg		   */
+	  }					/***************************/
+#if PCDOS					/* handle differently ifso */
+	_pc_chain(cmdline);			/* special home grown func */
+#else						/* O.S. handles it?	   */
+	__OSIF(SETDMA,cmdline);			/* DMA -> Command line	   */
+	__OSIF(P_CHAIN,0);			/* chain to program        */
+#endif
+	RETERR(FAILURE,ENOENT);			/* error: file not found   */
+}						/***************************/