ecpg.c

Go to the documentation of this file.

/* src/interfaces/ecpg/preproc/ecpg.c */

/* Main for ecpg, the PostgreSQL embedded SQL precompiler. */
/* Copyright (c) 1996-2017, PostgreSQL Global Development Group */

#include "postgres_fe.h"

#include <unistd.h>

#include "getopt_long.h"

#include "extern.h"

int         ret_value = 0;
bool        autocommit = false,
            auto_create_c = false,
            system_includes = false,
            force_indicator = true,
            questionmarks = false,
            regression_mode = false,
            auto_prepare = false;

char       *output_filename;

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"
             "                 this affects EXEC SQL TYPE\n"));
    printf(_("  -C MODE        set compatibility mode; MODE can be one of\n"
             "                 \"INFORMIX\", \"INFORMIX_SE\"\n"));
#ifdef YYDEBUG
    printf(_("  -d             generate parser debug output\n"));
#endif
    printf(_("  -D SYMBOL      define SYMBOL\n"));
    printf(_("  -h             parse a header file, this option includes option \"-c\"\n"));
    printf(_("  -i             parse system include files as well\n"));
    printf(_("  -I DIRECTORY   search DIRECTORY for include files\n"));
    printf(_("  -o OUTFILE     write result to OUTFILE\n"));
    printf(_("  -r OPTION      specify run-time behavior; OPTION can be:\n"
             "                 \"no_indicator\", \"prepare\", \"questionmarks\"\n"));
    printf(_("  --regression   run in regression testing mode\n"));
    printf(_("  -t             turn on autocommit of transactions\n"));
    printf(_("  -V, --version  output version information, then exit\n"));
    printf(_("  -?, --help     show this help, 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 has 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("1");
    }
    defines->pertinent = true;
    defines->used = NULL;
    defines->next = pd;
}

#define ECPG_GETOPT_LONG_REGRESSION     1
int
main(int argc, char *const argv[])
{
    static struct option ecpg_options[] = {
        {"regression", no_argument, NULL, ECPG_GETOPT_LONG_REGRESSION},
        {NULL, 0, NULL, 0}
    };

    int         fnr,
                c,
                out_option = 0;
    bool        verbose = false,
                header_mode = false;
    struct _include_path *ip;
    const char *progname;
    char        my_exec_path[MAXPGPATH];
    char        include_path[MAXPGPATH];

    set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("ecpg"));

    progname = get_progname(argv[0]);

    if (find_my_exec(argv[0], my_exec_path) < 0)
    {
        fprintf(stderr, _("%s: could not locate my own executable path\n"), argv[0]);
        return ILLEGAL_OPTION;
    }

    if (argc > 1)
    {
        if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
        {
            help(progname);
            exit(0);
        }
        if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
        {
            printf("ecpg %s\n", PG_VERSION);
            exit(0);
        }
    }

    output_filename = NULL;
    while ((c = getopt_long(argc, argv, "vcio:I:tD:dC:r:h", ecpg_options, NULL)) != -1)
    {
        switch (c)
        {
            case ECPG_GETOPT_LONG_REGRESSION:
                regression_mode = true;
                break;
            case 'o':
                output_filename = mm_strdup(optarg);
                if (strcmp(output_filename, "-") == 0)
                    base_yyout = stdout;
                else
                    base_yyout = fopen(output_filename, PG_BINARY_W);

                if (base_yyout == NULL)
                {
                    fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
                            progname, output_filename, strerror(errno));
                    output_filename = NULL;
                }
                else
                    out_option = 1;
                break;
            case 'I':
                add_include_path(optarg);
                break;
            case 't':
                autocommit = true;
                break;
            case 'v':
                verbose = true;
                break;
            case 'h':
                header_mode = true;
                /* this must include "-c" to make sense */
                /* so do not place a "break;" here */
            case 'c':
                auto_create_c = true;
                break;
            case 'i':
                system_includes = true;
                break;
            case 'C':
                if (strncmp(optarg, "INFORMIX", strlen("INFORMIX")) == 0)
                {
                    char        pkginclude_path[MAXPGPATH];
                    char        informix_path[MAXPGPATH];

                    compat = (strcmp(optarg, "INFORMIX") == 0) ? ECPG_COMPAT_INFORMIX : ECPG_COMPAT_INFORMIX_SE;
                    get_pkginclude_path(my_exec_path, pkginclude_path);
                    snprintf(informix_path, MAXPGPATH, "%s/informix/esql", pkginclude_path);
                    add_include_path(informix_path);
                }
                else
                {
                    fprintf(stderr, _("Try \"%s --help\" for more information.\n"), argv[0]);
                    return ILLEGAL_OPTION;
                }
                break;
            case 'r':
                if (strcmp(optarg, "no_indicator") == 0)
                    force_indicator = false;
                else if (strcmp(optarg, "prepare") == 0)
                    auto_prepare = true;
                else if (strcmp(optarg, "questionmarks") == 0)
                    questionmarks = true;
                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
                base_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");
    get_include_path(my_exec_path, include_path);
    add_include_path(include_path);
    add_include_path("/usr/include");

    if (verbose)
    {
        fprintf(stderr,
                _("%s, the PostgreSQL embedded C preprocessor, version %s\n"),
                progname, PG_VERSION);
        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       *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");
                base_yyin = stdin;
            }
            else
            {
                input_filename = mm_alloc(strlen(argv[fnr]) + 5);
                strcpy(input_filename, argv[fnr]);

                /* take care of relative paths */
                ptr2ext = last_dir_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 or .pgh */
                    ptr2ext[0] = '.';
                    ptr2ext[1] = 'p';
                    ptr2ext[2] = 'g';
                    ptr2ext[3] = (header_mode == true) ? 'h' : 'c';
                    ptr2ext[4] = '\0';
                }

                base_yyin = fopen(input_filename, PG_BINARY_R);
            }

            if (out_option == 0)    /* calculate the output name */
            {
                if (strcmp(input_filename, "stdin") == 0)
                    base_yyout = stdout;
                else
                {
                    output_filename = mm_alloc(strlen(input_filename) + 3);
                    strcpy(output_filename, input_filename);

                    ptr2ext = strrchr(output_filename, '.');
                    /* make extension = .c resp. .h */
                    ptr2ext[1] = (header_mode == true) ? 'h' : 'c';
                    ptr2ext[2] = '\0';

                    base_yyout = fopen(output_filename, PG_BINARY_W);
                    if (base_yyout == NULL)
                    {
                        fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
                                progname, output_filename, strerror(errno));
                        free(output_filename);
                        free(input_filename);
                        continue;
                    }
                }
            }

            if (base_yyin == NULL)
                fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
                        progname, argv[fnr], strerror(errno));
            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));

                /*
                 * and our variable counter for out of scope cursors'
                 * variables
                 */
                ecpg_internal_var = 0;

                /* finally the actual connection */
                connection = NULL;

                /* initialize lex */
                lex_init();

                /* we need several includes */
                /* but not if we are in header mode */
                if (regression_mode)
                    fprintf(base_yyout, "/* Processed by ecpg (regression mode) */\n");
                else
                    fprintf(base_yyout, "/* Processed by ecpg (%s) */\n", PG_VERSION);

                if (header_mode == false)
                {
                    fprintf(base_yyout, "/* These include files are added by the preprocessor */\n#include <ecpglib.h>\n#include <ecpgerrno.h>\n#include <sqlca.h>\n");

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

                    fprintf(base_yyout, "/* End of automatic include section */\n");
                }

                if (regression_mode)
                    fprintf(base_yyout, "#define ECPGdebug(X,Y) ECPGdebug((X)+100,(Y))\n");

                output_line_number();

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

                /*
                 * Check whether all cursors were indeed opened.  It does not
                 * really make sense to declare a cursor but not open it.
                 */
                for (ptr = cur; ptr != NULL; ptr = ptr->next)
                    if (!(ptr->opened))
                        mmerror(PARSE_ERROR, ET_WARNING, "cursor \"%s\" has been declared but not opened", ptr->name);

                if (base_yyin != NULL && base_yyin != stdin)
                    fclose(base_yyin);
                if (out_option == 0 && base_yyout != stdout)
                    fclose(base_yyout);

                /*
                 * If there was an error, delete the output file.
                 */
                if (ret_value != 0)
                {
                    if (strcmp(output_filename, "-") != 0 && unlink(output_filename) != 0)
                        fprintf(stderr, _("could not remove output file \"%s\"\n"), output_filename);
                }
            }

            if (output_filename && out_option == 0)
                free(output_filename);

            free(input_filename);
        }
    }
    return ret_value;
}