/*      Id: soelim.c,v 1.6 2021/09/19 18:14:24 schwarze Exp     */
/*
* Copyright (c) 2014 Baptiste Daroussin <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer
*    in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"

#include <sys/types.h>

#include <ctype.h>
#if HAVE_ERR
#include <err.h>
#endif
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if HAVE_STRINGLIST
#include <stringlist.h>
#else
#include "compat_stringlist.h"
#endif
#include <unistd.h>

#define C_OPTION 0x1

static StringList *includes;

static void
usage(void)
{

       fprintf(stderr, "usage: soelim [-Crtv] [-I dir] [files]\n");

       exit(EXIT_FAILURE);
}

static FILE *
soelim_fopen(const char *name)
{
       FILE *f;
       char path[PATH_MAX];
       size_t i;

       if (strcmp(name, "-") == 0)
               return (stdin);

       if ((f = fopen(name, "r")) != NULL)
               return (f);

       if (*name == '/') {
               warn("can't open '%s'", name);
               return (NULL);
       }

       for (i = 0; i < includes->sl_cur; i++) {
               snprintf(path, sizeof(path), "%s/%s", includes->sl_str[i],
                   name);
               if ((f = fopen(path, "r")) != NULL)
                       return (f);
       }

       warn("can't open '%s'", name);

       return (f);
}

static int
soelim_file(FILE *f, int flag)
{
       char *line = NULL;
       char *walk, *cp;
       size_t linecap = 0;
       ssize_t linelen;

       if (f == NULL)
               return (1);

       while ((linelen = getline(&line, &linecap, f)) > 0) {
               if (strncmp(line, ".so", 3) != 0) {
                       printf("%s", line);
                       continue;
               }

               walk = line + 3;
               if (!isspace((unsigned char)*walk) && (flag & C_OPTION) == 0) {
                       printf("%s", line);
                       continue;
               }

               while (isspace((unsigned char)*walk))
                       walk++;

               cp = walk;
               while (*cp != '\0' && !isspace((unsigned char)*cp))
                       cp++;
               *cp = 0;
               if (cp < line + linelen)
                       cp++;

               if (*walk == '\0') {
                       printf("%s", line);
                       continue;
               }
               if (soelim_file(soelim_fopen(walk), flag) == 1) {
                       free(line);
                       return (1);
               }
               if (*cp != '\0')
                       printf("%s", cp);
       }

       free(line);
       fclose(f);

       return (0);
}

int
main(int argc, char **argv)
{
       int ch, i;
       int ret = 0;
       int flags = 0;

       includes = sl_init();
       if (includes == NULL)
               err(EXIT_FAILURE, "sl_init()");

       while ((ch = getopt(argc, argv, "CrtvI:")) != -1) {
               switch (ch) {
               case 'C':
                       flags |= C_OPTION;
                       break;
               case 'r':
               case 'v':
               case 't':
                       /* stub compatibility with groff's soelim */
                       break;
               case 'I':
                       sl_add(includes, optarg);
                       break;
               default:
                       sl_free(includes, 0);
                       usage();
               }
       }

       argc -= optind;
       argv += optind;

       if (argc == 0)
               ret = soelim_file(stdin, flags);

       for (i = 0; i < argc; i++)
               ret = soelim_file(soelim_fopen(argv[i]), flags);

       sl_free(includes, 0);

       return (ret);
}