cwd.c

来自「俄罗斯高人Mamaich的Pocket gcc编译器（运行在PocketPC上）」· C语言 代码 · 共 92 行

#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <sys/wcebase.h>
#include <sys/wcefile.h>
#include <sys/wcetrace.h>

#define MAXDIRLEN  (128)
#define MAXPATHLEN (256)

char __curdir[MAXDIRLEN];
static int Initialized = FALSE;

int
chdir(const char *path)
{
  struct stat st;
  char   fpath[MAX_PATH];
  char  *cp = NULL;

  if (path == NULL || strlen(path) == 0) {
    errno = EFAULT;
    return(-1);
  }

  WCETRACE(WCE_IO, "chdir: path \"%s\"", path);
  fixpath(path, fpath);

  if (stat(fpath, &st) < 0) {
    errno = ENOENT;
    WCETRACE(WCE_IO, "chdir: return ENOENT");
    return(-1);
  }

  if (!S_ISDIR(st.st_mode)) {
    errno = ENOTDIR;
    WCETRACE(WCE_IO, "chdir: return ENOTDIR");
    return(-1);
  }

  strncpy(__curdir, fpath, MAXDIRLEN);
  Initialized = 1;

  /* Change backslashes to forward slashes */
  cp = __curdir;
  while (*cp != NULL) {
    if (*cp == '\\')
      *cp = '/';
    cp++;
  }
  WCETRACE(WCE_IO, "chdir: success, cwd is \"%s\"", __curdir);
  return(0);
}

char *
getcwd(char *buf, size_t size)
{
  int len;

  /* This is NOT compliant with what Linux does.. */
  if (buf == NULL || size == 0) {
    return(NULL);
  }

  /* Make sure that *something* is in here */
  if (!Initialized) {
    memset(__curdir, 0, MAXDIRLEN);
    __curdir[0] = '/';
    Initialized = 1;
  }
  
  if (len = strlen(__curdir) > 0) {
    if (len > size) {
      errno = ERANGE;
      return(-1);
    }

    strncpy(buf, __curdir, strlen(__curdir)+1);
  } else {
    WCETRACE(WCE_IO, "getcwd WARNING: __curdir is unset");
  }

  return(buf);
}