/*
                               file_utils.c

                 c  Ronny Lorenz
                 Vienna RNA package
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdarg.h>
#include <errno.h>
#include <libgen.h>

#include "ViennaRNA/utils.h"
#include "ViennaRNA/file_utils.h"

#define PRIVATE  static
#define PUBLIC

/*
#################################
# GLOBAL VARIABLES              #
#################################
*/


/*
#################################
# PRIVATE VARIABLES             #
#################################
*/
#ifdef _WIN32
#ifdef __MINGW32__
#include <direct.h>
#endif
#define DIRSEPC '\\'
#define DIRSEPS "\\"
#else
#define DIRSEPC '/'
#define DIRSEPS "/"
#endif

/*
#################################
# PRIVATE FUNCTION DECLARATIONS #
#################################
*/
PRIVATE int is_absolute_path(const char *p);


/*
#################################
# BEGIN OF FUNCTION DEFINITIONS #
#################################
*/

PUBLIC void
vrna_file_copy(FILE *from, FILE *to){

  int c;

  while ((c = getc(from)) != EOF) (void)putc(c, to);
}


PUBLIC char *
vrna_read_line(FILE *fp){ /* reads lines of arbitrary length from fp */

  char s[512], *line, *cp;
  int len=0, size=0, l;
  line=NULL;
  do {
    if (fgets(s, 512, fp)==NULL) break;
    cp = strchr(s, '\n');
    if (cp != NULL) *cp = '\0';
    l = len + (int)strlen(s);
    if (l+1>size) {
      size = (int)((l+1)*1.2);
      line = (char *) vrna_realloc(line, size*sizeof(char));
    }
    strcat(line+len, s);
    len=l;
  } while(cp==NULL);

  return line;
}


PUBLIC int
vrna_mkdir_p(const char *path){
  struct stat sb;
  char *slash, *ptr;
  int done = 0;

  if(!is_absolute_path(path))
    ptr = vrna_strdup_printf(".%c%s", DIRSEPC, path);
  else
    ptr = strdup(path);

  slash = ptr;

  while (!done) {
    slash += strspn(slash, DIRSEPS);
    slash += strcspn(slash, DIRSEPS);

    done = (*slash == '\0');
    *slash = '\0';

    if (stat(ptr, &sb)) {
#ifdef _WIN32
      if (errno != ENOENT || (_mkdir(ptr) &&
          errno != EEXIST)) {
#else
      if (errno != ENOENT || (mkdir(ptr, 0777) &&
          errno != EEXIST)) {
#endif
        vrna_message_warning("Can't create directory %s", ptr);
        free(ptr);
        return -1;
      }
    } else if (!S_ISDIR(sb.st_mode)) {
      vrna_message_warning("File exists but is not a directory %s: %s", ptr, strerror(ENOTDIR));
      free(ptr);
      return -1;
    }

    *slash = DIRSEPC;
  }

  free(ptr);
  return 0;
}


PUBLIC char *
vrna_basename(const char *path){

  char  *name, *p, *ptr;
  int   pos;

  name = NULL;

  if(path){
    ptr = strrchr(path, DIRSEPC);

    if(ptr && (*(ptr + 1) != '\0'))
      name = strdup(ptr + 1);
    else if(!ptr)
      name = strdup(path);
  }

  return name;
}


PUBLIC char *
vrna_dirname(const char *path){

  char  *name, *p, *ptr;
  int   pos;

  name = NULL;

  if(path){
    if(!is_absolute_path(path))
      ptr = vrna_strdup_printf(".%c%s", DIRSEPC, path);
    else
      ptr = strdup(path);

    pos = (int)strlen(ptr);
    p   = ptr + pos;

    do{ /* remove part after last separator */
      *p = '\0';
    } while((--p > ptr) && (*p != DIRSEPC));

    if(p > ptr)
      name = ptr;
  }

  return name;
}


#ifdef _WIN32
PRIVATE int
is_drive_char(const char c){

  if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
    return 1;
  return 0;
}
#endif


PRIVATE int
is_absolute_path(const char *p){

  if(*p == DIRSEPC)
    return 1;
#ifdef _WIN32
  if(is_drive_char((const char)*p) && (strlen(p) > 3))
    if((*(p + 1) == ':') && ((*(p + 2) == '\\') || (*(p + 2) == '/')))
      return 1;
#endif
  return 0;
}