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219 mateuszvis 1
/*
994 mateusz.vi 2
 * This file is part of pkg (SvarDOS package manager)
1678 mateusz.vi 3
 * Copyright (C) 2012-2024 Mateusz Viste
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 *
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 * It contains a few helper function...
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 */
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#include <ctype.h>    /* tolower() */
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#include <direct.h>   /* provides the mkdir() prototype */
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#include <string.h>   /* */
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#include <stdio.h>    /* sprintf() */
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#include <stdlib.h>   /* atoi() */
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#include <sys/stat.h> /* mkdir() */
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#include "trim.h"
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#include "helpers.h"
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/* change all / to \ in a string */
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void slash2backslash(char *str) {
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  int x;
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  for (x = 0; str[x] != 0; x++) {
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    if (str[x] == '/') str[x] = '\\';
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  }
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}
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1678 mateusz.vi 29
/* trim CRC from a filename and returns a pointer to the CRC part.
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 * this is used to parse filename lines from LSM files */
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char *trimfnamecrc(char *fname) {
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  while (*fname) {
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    if (*fname == '?') {
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      *fname = 0;
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      return(fname + 1);
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    }
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    fname++;
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  }
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  return(0);
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}
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void removeDoubleBackslashes(char *str) {
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  char *curpos;
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  int x;
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  for (;;) {
251 mateuszvis 47
    curpos = strstr(str, "\\\\");
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    if (curpos == NULL) return; /* job done */
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    for (x = 1; curpos[x] != 0; x++) {
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      curpos[x - 1] = curpos[x];
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    }
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    curpos[x - 1] = 0;
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  }
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}
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/* Find the first occurrence of find in s, ignore case. */
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char *fdnpkg_strcasestr(const char *s, const char *find) {
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  char c, sc;
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  size_t len;
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  if ((c = *find++) != 0) {
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    c = tolower((unsigned char)c);
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    len = strlen(find);
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    do {
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      do {
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        if ((sc = *s++) == 0) return(NULL);
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      } while ((char)tolower((unsigned char)sc) != c);
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    } while (strncasecmp(s, find, len) != 0);
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    s--;
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  }
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  return((char *)s);
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}
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/* Creates directories recursively */
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void mkpath(char *dirs) {
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  int x;
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  char savechar;
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  for (x = 0; dirs[x] != 0; x++) {
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    if (((dirs[x] == '/') || (dirs[x] == '\\')) && (x > 0)) {
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      if (dirs[x - 1] != ':') { /* avoid d:\ stuff */
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        savechar = dirs[x];
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        dirs[x] = 0;
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        /* make the dir */
240 mateuszvis 85
        mkdir(dirs);
219 mateuszvis 86
        dirs[x] = savechar;
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      }
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    }
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  }
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}
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/* returns a pointer to the start of the filename, out of a path\to\file string, and
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   fills respath with the local folder where the file should be placed. */
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char *computelocalpath(char *longfilename, char *respath, const char *dosdir, const struct customdirs *dirlist) {
219 mateuszvis 96
  int x, lastsep = 0, firstsep = -1;
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  char savedchar;
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  char *shortfilename, *pathstart;
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  pathstart = longfilename;
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  for (x = 0; longfilename[x] != 0; x++) {
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    if ((longfilename[x] == '/') || (longfilename[x] == '\\')) {
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      lastsep = x;
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      if (firstsep < 0) firstsep = x;
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    }
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  }
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  /* if it's a file without any directory, then it goes to C:\ (COMMAND.COM, KERNEL.SYS...) */
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  if (firstsep < 0) {
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    sprintf(respath, "C:\\");
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    return(longfilename);
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  }
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  /* */
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  shortfilename = &longfilename[lastsep + 1];
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  /* look for possible custom path */
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  if (firstsep > 0) {
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    savedchar = longfilename[firstsep];
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    longfilename[firstsep] = 0;
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    for (; dirlist != NULL; dirlist = dirlist->next) {
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      if (fdnpkg_strcasestr(longfilename, dirlist->name) == longfilename) { /* found! */
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        /* sprintf(respath, "%s\\%s", dirlist->location, &longfilename[firstsep + 1]); */
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        pathstart = &longfilename[firstsep + 1];
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        dosdir = dirlist->location;
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        break;
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      }
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    }
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    longfilename[firstsep] = savedchar; /* restore longfilename as it was */
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  }
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  /* apply the default (DOSDIR) path */
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  savedchar = longfilename[lastsep + 1];
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  longfilename[lastsep + 1] = 0;
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  sprintf(respath, "%s\\%s", dosdir, pathstart);
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  slash2backslash(respath);
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  removeDoubleBackslashes(respath);
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  longfilename[lastsep + 1] = savedchar;
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  return(shortfilename);
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}
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/* analyzes a filename string and returns the pointer to the file's extension
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 * (which can be empty) */
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char *getfext(char *fname) {
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  char *res = NULL;
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  for (; *fname != 0; fname++) {
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    if (*fname == '.') res = fname + 1;
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  }
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  /* if no dot found, then point to the string's null terminator */
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  if (res == NULL) return(fname);
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  return(res);
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}
248 mateuszvis 149
 
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/* reads a line from a "token = value" file, returns 0 on success
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 * val (if not NULL) is updated with a pointer to the "value" part
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 * delim is the delimiter char (typically ':' or '=' but can be anything) */
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int freadtokval(FILE *fd, char *line, size_t maxlen, char **val, char delim) {
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  int bytebuff, linelen = 0;
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  if (val != NULL) *val = NULL;
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  for (;;) {
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    bytebuff = fgetc(fd);
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    if (bytebuff == EOF) {
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      if (linelen == 0) return(-1);
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      break;
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    }
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    if (bytebuff < 0) return(-1);
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    if ((*val == NULL) && (bytebuff == delim)) {
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      line[linelen++] = 0;
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      *val = line + linelen;
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      continue;
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    }
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    if (bytebuff == '\r') continue; /* ignore CR */
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    if (bytebuff == '\n') break;
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    if (linelen < maxlen - 1) line[linelen++] = bytebuff;
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  }
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  /* terminate line and trim token and value (if any) */
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  line[linelen] = 0;
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  trim(line);
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  if ((val != NULL) && (*val != NULL)) trim(*val);
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  return(0);
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}