/* $Header: /cvsroot/pgsql/src/interfaces/ecpg/preproc/ecpg.c,v 1.71 2003/05/27 14:36:00 meskes Exp $ */

/* New main for ecpg, the PostgreSQL embedded SQL precompiler. */
/* (C) Michael Meskes <meskes@postgresql.org> Feb 5th, 1998 */
/* Placed under the same license as PostgreSQL */

#include "postgres_fe.h"

#include <unistd.h>
#include <string.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif

extern int	optind;
extern char *optarg;

#include "extern.h"

int			ret_value = 0,
			autocommit = false,
			auto_create_c = false,
			system_includes = false;

enum COMPAT_MODE	compat = ECPG_COMPAT_PGSQL;

struct _include_path *include_paths = NULL;
struct cursor *cur = NULL;
struct typedefs *types = NULL;
struct _defines *defines = NULL;

static void
help(const char *progname)
{
	printf("%s is the PostgreSQL embedded SQL preprocessor for C programs.\n\n",
		   progname);
	printf("Usage:\n"
		   "  %s [OPTION]... FILE...\n\n",
		   progname);
	printf("Options:\n");
	printf("  -c             automatically generate C code from embedded SQL code;\n"
		   "                 currently this works for EXEC SQL TYPE\n");
#ifdef YYDEBUG
	printf("  -d             generate parser debug output\n");
#endif
	printf("  -C <mode>      set compatibility mode\n"
		   "                 mode may be INFORMIX only at the moment\n"
		   "                 INFORMIX mode implies '-i'\n");
	printf("  -D SYMBOL      define SYMBOL\n");
	printf("  -I DIRECTORY   search DIRECTORY for include files\n");
	printf("  -o OUTFILE     write result to OUTFILE\n");
	printf("  -t             turn on autocommit of transactions\n");
	printf("  -i             parse system include files as well\n");
	printf("  --help         show this help, then exit\n");
	printf("  --version      output version information, then exit\n");
	printf("\nIf no output file is specified, the name is formed by adding .c to the\n"
		   "input file name, after stripping off .pgc if present.\n");
	printf("\nReport bugs to <pgsql-bugs@postgresql.org>.\n");
}

static void
add_include_path(char *path)
{
	struct _include_path *ip = include_paths, *new;

	new = mm_alloc(sizeof(struct _include_path));
	new->path = path;
	new->next = NULL;

	if (ip == NULL)
		include_paths = new;
	else
	{
		for (;ip->next != NULL; ip=ip->next);
		ip->next = new;
	}
}

static void
add_preprocessor_define(char *define)
{
	struct _defines *pd = defines;
	char *ptr, *define_copy = mm_strdup(define);
	
	defines = mm_alloc(sizeof(struct _defines));
	
	/* look for = sign */
	ptr = strchr(define_copy, '=');
	if (ptr != NULL)
	{
		char *tmp;
		
		/* symbol gets a value */
		for (tmp=ptr-1; *tmp == ' '; tmp--);
		tmp[1] = '\0';
		defines->old = define_copy;
		defines->new = ptr+1;
	}
	else
	{
		defines->old = define_copy;
		defines->new = mm_strdup("");
	}
	defines->pertinent = true;
	defines->next = pd;
}

int
main(int argc, char *const argv[])
{
	int			fnr,
				c,
				verbose = false,
				out_option = 0;
	struct _include_path *ip;
	char	   *progname;

	progname = get_progname(argv[0]);

	if (argc > 1)
	{
		if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
		{
			help(progname);
			exit(0);
		}
		else if (strcmp(argv[1], "--version") == 0)
		{
			printf("ecpg (PostgreSQL %s) %d.%d.%d\n", PG_VERSION,
				   MAJOR_VERSION, MINOR_VERSION, PATCHLEVEL);
			exit(0);
		}
	}

	while ((c = getopt(argc, argv, "vcio:I:tD:dC:")) != -1)
	{
		switch (c)
		{
			case 'o':
				if (strcmp(optarg, "-") == 0) 
					yyout = stdout;
				else
					yyout = fopen(optarg, PG_BINARY_W);
				
				if (yyout == NULL)
					perror(optarg);
				else
					out_option = 1;
				break;
			case 'I':
				add_include_path(optarg);
				break;
			case 't':
				autocommit = true;
				break;
			case 'v':
				verbose = true;
				break;
			case 'c':
				auto_create_c = true;
				break;
			case 'i':
				system_includes = true;
				break;
			case 'C':
				if (strcmp(optarg, "INFORMIX") == 0)
				{
					compat = ECPG_COMPAT_INFORMIX;
					/* system_includes = true; */
					add_preprocessor_define("dec_t=Numeric");
					add_preprocessor_define("intrvl_t=Interval");
				}
				else
				{
					fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
					return ILLEGAL_OPTION;
				}				
				break;
			case 'D':
				add_preprocessor_define(optarg);
				break;
			case 'd':
#ifdef YYDEBUG
				yydebug = 1;
#else
				fprintf(stderr, "%s: parser debug support (-d) not available\n",
						progname);
#endif
				break;
			default:
				fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
				return ILLEGAL_OPTION;
		}
	}

	add_include_path(".");
	add_include_path("/usr/local/include");
	add_include_path(INCLUDE_PATH);
	add_include_path("/usr/include");

	if (verbose)
	{
		fprintf(stderr, "%s, the PostgreSQL embedded C preprocessor, version %d.%d.%d\n",
				progname, MAJOR_VERSION, MINOR_VERSION, PATCHLEVEL);
		fprintf(stderr, "exec sql include ... search starts here:\n");
		for (ip = include_paths; ip != NULL; ip = ip->next)
			fprintf(stderr, " %s\n", ip->path);
		fprintf(stderr, "end of search list\n");
		return 0;
	}

	if (optind >= argc)			/* no files specified */
	{
		fprintf(stderr, "%s: no input files specified\n", progname);
		fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
		return (ILLEGAL_OPTION);
	}
	else
	{
		/* after the options there must not be anything but filenames */
		for (fnr = optind; fnr < argc; fnr++)
		{
			char	   *output_filename = NULL,
					   *ptr2ext;

			/* If argv[fnr] is "-" we have to read from stdin */
			if (strcmp(argv[fnr], "-") == 0)
			{
				input_filename = mm_alloc(strlen("stdin")+1);
				strcpy(input_filename, "stdin");
				yyin = stdin;
			}
			else
			{
				input_filename = mm_alloc(strlen(argv[fnr]) + 5);
				strcpy(input_filename, argv[fnr]);

				/* take care of relative paths */
				ptr2ext = last_path_separator(input_filename);
				ptr2ext = (ptr2ext ? strrchr(ptr2ext, '.') : strrchr(input_filename, '.'));

				/* no extension? */
				if (ptr2ext == NULL)
				{
					ptr2ext = input_filename + strlen(input_filename);

					/* no extension => add .pgc */
					ptr2ext[0] = '.';
					ptr2ext[1] = 'p';
					ptr2ext[2] = 'g';
					ptr2ext[3] = 'c';
					ptr2ext[4] = '\0';
				}
				
				yyin = fopen(input_filename, PG_BINARY_R);
			}

			if (out_option == 0)	/* calculate the output name */
			{
				if (strcmp(input_filename, "stdin") == 0)
					yyout = stdout;
				else
				{
					output_filename = strdup(input_filename);

					ptr2ext = strrchr(output_filename, '.');
					/* make extension = .c */
					ptr2ext[1] = 'c';
					ptr2ext[2] = '\0';

					yyout = fopen(output_filename, PG_BINARY_W);
					if (yyout == NULL)
					{
						perror(output_filename);
						free(output_filename);
						free(input_filename);
						continue;
					}
				}
			}

			if (yyin == NULL)
				perror(argv[fnr]);
			else
			{
				struct cursor *ptr;
				struct _defines *defptr;
				struct typedefs *typeptr;

				/* remove old cursor definitions if any are still there */
				for (ptr = cur; ptr != NULL;)
				{
					struct cursor *this = ptr;
					struct arguments *l1,
							   *l2;

					free(ptr->command);
					free(ptr->connection);
					free(ptr->name);
					for (l1 = ptr->argsinsert; l1; l1 = l2)
					{
						l2 = l1->next;
						free(l1);
					}
					for (l1 = ptr->argsresult; l1; l1 = l2)
					{
						l2 = l1->next;
						free(l1);
					}
					ptr = ptr->next;
					free(this);
				}
				cur = NULL;

				/* remove non-pertinent old defines as well */
				while (defines && !defines->pertinent)
				{
					defptr = defines;
					defines = defines->next;

					free(defptr->new);
					free(defptr->old);
					free(defptr);
				}

				for (defptr = defines; defptr != NULL; defptr = defptr->next)
				{
					struct _defines *this = defptr->next;

					if (this && !this->pertinent)
					{
						defptr->next = this->next;

						free(this->new);
						free(this->old);
						free(this);
					}
				}

				/* and old typedefs */
				for (typeptr = types; typeptr != NULL;)
				{
					struct typedefs *this = typeptr;

					free(typeptr->name);
					ECPGfree_struct_member(typeptr->struct_member_list);
					free(typeptr->type);
					typeptr = typeptr->next;
					free(this);
				}
				types = NULL;

				/* initialize whenever structures */
				memset(&when_error, 0, sizeof(struct when));
				memset(&when_nf, 0, sizeof(struct when));
				memset(&when_warn, 0, sizeof(struct when));

				/* and structure member lists */
				memset(struct_member_list, 0, sizeof(struct_member_list));

				/* finally the actual connection */
				connection = NULL;
				
				/* initialize lex */
				lex_init();

				/* we need several includes */
				fprintf(yyout, "/* Processed by ecpg (%d.%d.%d) */\n/* These four include files are added by the preprocessor */\n#include <ecpgtype.h>\n#include <ecpglib.h>\n#include <ecpgerrno.h>\n#include <sqlca.h>\n#line 1 \"%s\"\n", MAJOR_VERSION, MINOR_VERSION, PATCHLEVEL, input_filename);

				/* add some compatibility headers */
				if (compat == ECPG_COMPAT_INFORMIX)
					fprintf(yyout, "/* Needed for informix compatibility */\n#include <ecpg_informix.h>\n");

				/* and parse the source */
				yyparse();

				if (yyin != NULL && yyin != stdin)
					fclose(yyin);
				if (out_option == 0 && yyout != stdout)
					fclose(yyout);
			}

			if (output_filename)
				free(output_filename);

			free(input_filename);
		}
	}
	return ret_value;
}
