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+/* as.c - GAS main program.
+   Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.
+
+This file is part of GAS, the GNU Assembler.
+
+GAS is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GAS is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GAS; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* static const char rcsid[] = "$Id$"; */
+
+/*
+ * Main program for AS; a 32-bit assembler of GNU.
+ * Understands command arguments.
+ * Has a few routines that don't fit in other modules because they
+ * are shared.
+ *
+ *
+ *			bugs
+ *
+ * : initialisers
+ *	Since no-one else says they will support them in future: I
+ * don't support them now.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#ifdef _POSIX_SOURCE
+#include <sys/types.h>	/* For pid_t in signal.h */
+#endif
+#include <signal.h>
+
+#define COMMON
+
+#include "as.h"
+
+#ifdef __STDC__
+
+ /* This prototype for got_sig() is ansi.  If you want
+    anything else, then your compiler is lying to you when
+    it says that it is __STDC__.  If you want to change it,
+    #ifdef protect it from those of us with real ansi
+    compilers. */
+
+#define SIGTY void
+
+static void got_sig(int sig);
+static char *stralloc(char *str);
+static void perform_an_assembly_pass(int argc, char **argv);
+
+#else /* __STDC__ */
+
+#ifndef SIGTY
+#define SIGTY int
+#endif
+
+static SIGTY got_sig();
+static char *stralloc();	/* Make a (safe) copy of a string. */
+static void perform_an_assembly_pass();
+
+#endif /* __STDC__ */
+
+#ifdef DONTDEF
+static char * gdb_symbol_file_name;
+long gdb_begin();
+#endif
+
+char *myname;		/* argv[0] */
+extern char version_string[];
+
+int main(argc,argv)
+int argc;
+char **argv;
+{
+	int work_argc;	/* variable copy of argc */
+	char **work_argv;	/* variable copy of argv */
+	char *arg;		/* an arg to program */
+	char a;		/* an arg flag (after -) */
+	static const int sig[] = { SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
+
+	for(a=0;sig[a]!=0;a++)
+		if(signal(sig[a], SIG_IGN) != SIG_IGN)
+			signal(sig[a], got_sig);
+
+	myname=argv[0];
+	bzero (flagseen, sizeof(flagseen)); /* aint seen nothing yet */
+#ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
+#define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
+#endif /* OBJ_DEFAULT_OUTPUT_FILE_NAME */
+	out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
+
+	symbol_begin();		/* symbols.c */
+	subsegs_begin();		/* subsegs.c */
+	read_begin();			/* read.c */
+	md_begin();			/* MACHINE.c */
+	input_scrub_begin();		/* input_scrub.c */
+#ifdef DONTDEF
+	gdb_symbol_file_name = 0;
+#endif
+	/*
+	 * Parse arguments, but we are only interested in flags.
+	 * When we find a flag, we process it then make it's argv[] NULL.
+	 * This helps any future argv[] scanners avoid what we processed.
+	 * Since it is easy to do here we interpret the special arg "-"
+	 * to mean "use stdin" and we set that argv[] pointing to "".
+	 * After we have munged argv[], the only things left are source file
+	 * name(s) and ""(s) denoting stdin. These file names are used
+	 * (perhaps more than once) later.
+	 */
+ /* FIXME-SOMEDAY this should use getopt. */
+	work_argc = argc-1;		/* don't count argv[0] */
+	work_argv = argv+1;		/* skip argv[0] */
+	for (;work_argc--;work_argv++) {
+		arg = * work_argv;	/* work_argv points to this argument */
+
+		if (*arg!='-')		/* Filename. We need it later. */
+			continue;	/* Keep scanning args looking for flags. */
+		if (arg[1] == '-' && arg[2] == 0) {
+			/* "--" as an argument means read STDIN */
+			/* on this scan, we don't want to think about filenames */
+			* work_argv = "";	/* Code that means 'use stdin'. */
+			continue;
+		}
+				/* This better be a switch. */
+		arg ++;		/*->letter. */
+
+		while ((a = * arg) != '\0')  {/* scan all the 1-char flags */
+			arg ++;	/* arg->after letter. */
+			a &= 0x7F;	/* ascii only please */
+			if (flagseen[a])
+				as_tsktsk("%s: Flag option - %c has already been seen.", myname, a);
+			flagseen[a] = 1;
+			switch (a) {
+			case 'f':
+				break;	/* -f means fast - no need for "app" preprocessor. */
+
+			case 'D':
+				/* DEBUG is implemented: it debugs different */
+				/* things to other people's assemblers. */
+				break;
+
+#ifdef DONTDEF
+			case 'G':	/* GNU AS switch: include gdbsyms. */
+				if (*arg)	/* Rest of argument is file-name. */
+					gdb_symbol_file_name = stralloc (arg);
+				else if (work_argc) {	/* Next argument is file-name. */
+					work_argc --;
+					* work_argv = NULL; /* Not a source file-name. */
+					gdb_symbol_file_name = * ++ work_argv;
+				} else
+					as_warn("%s: I expected a filename after -G", myname);
+				arg = "";	/* Finished with this arg. */
+				break;
+#endif
+
+			case 'I': { /* Include file directory */
+				
+				char *temp;
+				if (*arg)
+				    temp = stralloc (arg);
+				else if (work_argc) {
+					* work_argv = NULL;
+					work_argc--;
+					temp = * ++ work_argv;
+				} else
+				    as_warn("%s: I expected a filename after -I", myname);
+				add_include_dir (temp);
+				arg = "";	/* Finished with this arg. */
+				break;
+			}
+
+#ifndef WORKING_DOT_WORD
+			case 'k':
+				break;
+#endif
+
+			case 'L': /* -L means keep L* symbols */
+				break;
+
+			case 'o':
+				if (*arg)	/* Rest of argument is object file-name. */
+					out_file_name = stralloc (arg);
+				else if (work_argc) {	/* Want next arg for a file-name. */
+					* work_argv = NULL; /* This is not a file-name. */
+					work_argc--;
+					out_file_name = * ++ work_argv;
+				} else
+					as_warn("%s: I expected a filename after -o. \"%s\" assumed.", myname, out_file_name);
+				arg = "";	/* Finished with this arg. */
+				break;
+
+			case 'R':
+				/* -R means put data into text segment */
+				break;
+
+			case 'v':
+#ifdef	VMS
+				{
+				extern char *compiler_version_string;
+				compiler_version_string = arg;
+				}
+#else /* not VMS */
+				fprintf(stderr,version_string);
+				if(*arg && strcmp(arg,"ersion"))
+					as_warn("Unknown -v option ignored");
+#endif
+				while(*arg) arg++;	/* Skip the rest */
+				break;
+
+			case 'W':
+				/* -W means don't warn about things */
+			case 'X':
+				/* -X means treat warnings as errors */
+			case 'Z':
+				/* -Z means attempt to generate object file even after errors. */
+				break;
+
+			default:
+				--arg;
+				if(md_parse_option(&arg,&work_argc,&work_argv)==0)
+					as_warn("%s: I don't understand '%c' flag.", myname, a);
+				if(arg && *arg)
+					arg++;
+				break;
+			}
+		}
+		/*
+		 * We have just processed a "-..." arg, which was not a
+		 * file-name. Smash it so the
+		 * things that look for filenames won't ever see it.
+		 *
+		 * Whatever work_argv points to, it has already been used
+		 * as part of a flag, so DON'T re-use it as a filename.
+		 */
+		*work_argv = NULL; /* NULL means 'not a file-name' */
+	}
+#ifdef DONTDEF
+	if (gdb_begin(gdb_symbol_file_name) == 0)
+		flagseen ['G'] = 0;	/* Don't do any gdbsym stuff. */
+#endif
+	/* Here with flags set up in flagseen[]. */
+	perform_an_assembly_pass(argc,argv); /* Assemble it. */
+#ifdef TC_I960
+	brtab_emit();
+#endif
+	if (seen_at_least_1_file()
+	    && !((had_warnings() && flagseen['Z'])
+		 || had_errors() > 0)) { 
+		write_object_file(); /* relax() addresses then emit object file */
+	} /* we also check in write_object_file() just before emit. */
+
+	input_scrub_end();
+	md_end();			/* MACHINE.c */
+
+#ifndef	VMS
+	return((had_warnings() && flagseen['Z'])
+	       || had_errors() > 0);			/* WIN */
+#else	/* VMS */
+	return(!((had_warnings() && flagseen['Z'])
+		 || had_errors() > 0));			/* WIN */
+#endif	/* VMS */
+
+} /* main() */
+
+
+/*			perform_an_assembly_pass()
+ *
+ * Here to attempt 1 pass over each input file.
+ * We scan argv[*] looking for filenames or exactly "" which is
+ * shorthand for stdin. Any argv that is NULL is not a file-name.
+ * We set need_pass_2 TRUE if, after this, we still have unresolved
+ * expressions of the form (unknown value)+-(unknown value).
+ *
+ * Note the un*x semantics: there is only 1 logical input file, but it
+ * may be a catenation of many 'physical' input files.
+ */
+static void perform_an_assembly_pass(argc, argv)
+int argc;
+char **argv;
+{
+	int saw_a_file = 0;
+
+	text_fix_root		= NULL;
+	data_fix_root		= NULL;
+	need_pass_2		= 0;
+
+	subseg_new (SEG_TEXT, 0);
+
+	argv++;			/* skip argv[0] */
+	argc--;			/* skip argv[0] */
+	while (argc--) {
+		if (*argv) {		/* Is it a file-name argument? */
+			saw_a_file++;
+			/* argv->"" if stdin desired, else->filename */
+			read_a_source_file(*argv);
+		}
+		argv++;			/* completed that argv */
+	}
+	if(!saw_a_file)
+		read_a_source_file("");
+} /* perform_an_assembly_pass() */
+
+/*
+ *			stralloc()
+ *
+ * Allocate memory for a new copy of a string. Copy the string.
+ * Return the address of the new string. Die if there is any error.
+ */
+
+static char *
+stralloc (str)
+char *	str;
+{
+	register char *	retval;
+	register long len;
+
+	len = strlen (str) + 1;
+	retval = xmalloc (len);
+	(void) strcpy(retval, str);
+	return(retval);
+}
+
+#ifdef comment
+static void lose() {
+	as_fatal("%s: 2nd pass not implemented - get your code from random(3)", myname);
+	return;
+} /* lose() */
+#endif /* comment */
+
+static SIGTY
+got_sig(sig)
+int sig;
+{
+	static here_before = 0;
+
+	as_bad("Interrupted by signal %d", sig);
+	if(here_before++)
+		exit(1);
+	return((SIGTY) 0);
+}
+
+/*
+ * Local Variables:
+ * comment-column: 0
+ * fill-column: 131
+ * End:
+ */
+
+/* end: as.c */