/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * mkstr - create a string error message file by massaging C source
 *
 * Bill Joy UCB August 1977
 *
 * Modified March 1978 to hash old messages to be able to recompile
 * without addding messages to the message file (usually)
 *
 * Based on an earlier program conceived by Bill Joy and Chuck Haley
 *
 * Program to create a string error message file
 * from a group of C programs.  Arguments are the name
 * of the file where the strings are to be placed, the
 * prefix of the new files where the processed source text
 * is to be placed, and the files to be processed.
 *
 * The program looks for 'error("' in the source stream.
 * Whenever it finds this, the following characters from the '"'
 * to a '"' are replaced by 'seekpt' where seekpt is a
 * pointer into the error message file.
 * If the '(' is not immediately followed by a '"' no change occurs.
 *
 * The optional '-' causes strings to be added at the end of the
 * existing error message file for recompilation of single routines.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <sys/param.h>

#define ungetchar(c)    ungetc(c, stdin)

#define NBUCKETS        511

static char     usagestr[] =    "usage: %s [ - ] mesgfile prefix file ...\n";

static FILE     *mesgread, *mesgwrite;

static void process(void);
static int match(char *ocp);
static void copystr(void);
static int octdigit(char c);
static void inithash(void);
static int hashit(char *str, char really, unsigned int fakept);
static int fgetNUL(char *obuf, int rmdr, FILE *file);

int
main(int argc, char *argv[])
{
        char addon = 0;
        char *progname, *np, name[MAXPATHLEN];
        size_t size = 0;
        size_t len;

        (void) setlocale(LC_ALL, "");

#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN     "SYS_TEST"
#endif
        (void) textdomain(TEXT_DOMAIN);

        argc--, progname = *argv++;
        if (argc > 1 && argv[0][0] == '-')
                addon++, argc--, argv++;
        if (argc < 3)
                (void) fprintf(stderr, gettext(usagestr), progname), exit(1);
        mesgwrite = fopen(argv[0], addon ? "a" : "w");
        if (mesgwrite == NULL)
                perror(argv[0]), exit(1);
        mesgread = fopen(argv[0], "r");
        if (mesgread == NULL)
                perror(argv[0]), exit(1);
        inithash();
        argc--, argv++;

        if (strlcpy(name, argv[0], sizeof (name)) >= sizeof (name)) {
                (void) fprintf(stderr, gettext("%s: %s: string too long"),
                        progname, argv[0]);
                exit(1);
        }

        np = name + strlen(name);

        len = strlen(name);
        np = name + len;
        size = sizeof (name) - len;
        argc--, argv++;
        do {
                if (strlcpy(np, argv[0], size) >= size) {
                        (void) fprintf(stderr,
                                gettext("%s: %s: string too long"),
                                progname, argv[0]);
                        exit(1);
                }
                if (freopen(name, "w", stdout) == NULL)
                        perror(name), exit(1);
                if (freopen(argv[0], "r", stdin) == NULL)
                        perror(argv[0]), exit(1);
                process();
                argc--, argv++;
        } while (argc > 0);

        return (0);
}

static void
process(void)
{
        int c;

        for (;;) {
                c = getchar();
                if (c == EOF)
                        return;
                if (c != 'e') {
                        (void) putchar(c);
                        continue;
                }
                if (match("error(")) {
                        (void) printf(gettext("error("));
                        c = getchar();
                        if (c != '"')
                                (void) putchar(c);
                        else
                                copystr();
                }
        }
}

static int
match(char *ocp)
{
        char *cp;
        int c;

        for (cp = ocp + 1; *cp; cp++) {
                c = getchar();
                if (c != *cp) {
                        while (ocp < cp)
                                (void) putchar(*ocp++);
                        (void) ungetchar(c);
                        return (0);
                }
        }
        return (1);
}

static void
copystr(void)
{
        int c, ch;
        char buf[512];
        char *cp = buf;

        for (;;) {
                c = getchar();
                if (c == EOF)
                        break;
                switch (c) {

                case '"':
                        *cp++ = 0;
                        goto out;
                case '\\':
                        c = getchar();
                        switch (c) {

                        case 'b':
                                c = '\b';
                                break;
                        case 't':
                                c = '\t';
                                break;
                        case 'r':
                                c = '\r';
                                break;
                        case 'n':
                                c = '\n';
                                break;
                        case '\n':
                                continue;
                        case 'f':
                                c = '\f';
                                break;
                        case '0':
                                c = 0;
                                break;
                        case '\\':
                                break;
                        default:
                                if (!octdigit(c))
                                        break;
                                c -= '0';
                                ch = getchar();
                                if (!octdigit(ch))
                                        break;
                                c <<= 7, c += ch - '0';
                                ch = getchar();
                                if (!octdigit(ch))
                                        break;
                                c <<= 3, c += ch - '0', ch = -1;
                                break;
                        }
                }
                *cp++ = c;
        }
out:
        *cp = 0;
        (void) printf("%d", hashit(buf, 1, 0));
}

static int
octdigit(char c)
{

        return (c >= '0' && c <= '7');
}

static void
inithash(void)
{
        char buf[512];
        int mesgpt = 0;

        rewind(mesgread);
        while (fgetNUL(buf, sizeof (buf), mesgread) != 0) {
                (void) hashit(buf, 0, mesgpt);
                mesgpt += strlen(buf) + 2;
        }
}

static struct   hash {
        long    hval;
        unsigned int hpt;
        struct  hash *hnext;
} *bucket[NBUCKETS];

static int
hashit(char *str, char really, unsigned int fakept)
{
        int i;
        struct hash *hp;
        char buf[512];
        long hashval = 0;
        char *cp;

        if (really)
                (void) fflush(mesgwrite);
        for (cp = str; *cp; )
                hashval = (hashval << 1) + *cp++;
        i = hashval % NBUCKETS;
        if (i < 0)
                i += NBUCKETS;
        if (really != 0)
                for (hp = bucket[i]; hp != 0; hp = hp->hnext)
                if (hp->hval == hashval) {
                        (void) fseek(mesgread, (long)hp->hpt, 0);
                        (void) fgetNUL(buf, sizeof (buf), mesgread);
                        if (strcmp(buf, str) == 0)
                                break;
                }
        if (!really || hp == 0) {
                hp = (struct hash *)calloc(1, sizeof (*hp));
                hp->hnext = bucket[i];
                hp->hval = hashval;
                hp->hpt = really ? ftell(mesgwrite) : fakept;
                if (really) {
                        (void) fwrite(str, sizeof (char), strlen(str) + 1,
                                mesgwrite);
                        (void) fwrite("\n", sizeof (char), 1, mesgwrite);
                }
                bucket[i] = hp;
        }
        return (hp->hpt);
}

static int
fgetNUL(char *obuf, int rmdr, FILE *file)
{
        int c;
        char *buf = obuf;

        while (--rmdr > 0 && (c = getc(file)) != 0 && c != EOF)
                *buf++ = c;
        *buf++ = 0;
        (void) getc(file);
        return ((feof(file) || ferror(file)) ? 0 : 1);
}