/*=export_func optionMakePath
* private:
*
* what: translate and construct a path
* arg: + char * + p_buf + The result buffer +
* arg: + int + b_sz + The size of this buffer +
* arg: + char const * + fname + The input name +
* arg: + char const * + prg_path + The full path of the current program +
*
* ret-type: bool
* ret-desc: true if the name was handled, otherwise false.
* If the name does not start with ``$'', then it is handled
* simply by copying the input name to the output buffer and
* resolving the name with either
* @code{canonicalize_file_name(3GLIBC)} or @code{realpath(3C)}.
*
* doc:
*
* This routine will copy the @code{pzName} input name into the
* @code{pzBuf} output buffer, not exceeding @code{bufSize} bytes. If the
* first character of the input name is a @code{'$'} character, then there
* is special handling:
* @*
* @code{$$} is replaced with the directory name of the @code{pzProgPath},
* searching @code{$PATH} if necessary.
* @*
* @code{$@} is replaced with the AutoGen package data installation directory
* (aka @code{pkgdatadir}).
* @*
* @code{$NAME} is replaced by the contents of the @code{NAME} environment
* variable. If not found, the search fails.
*
* Please note: both @code{$$} and @code{$NAME} must be at the start of the
* @code{pzName} string and must either be the entire string or be followed
* by the @code{'/'} (backslash on windows) character.
*
* err: @code{false} is returned if:
* @*
* @bullet{} The input name exceeds @code{bufSize} bytes.
* @*
* @bullet{} @code{$$}, @code{$@@} or @code{$NAME} is not the full string
* and the next character is not '/'.
* @*
* @bullet{} libopts was built without PKGDATADIR defined and @code{$@@}
* was specified.
* @*
* @bullet{} @code{NAME} is not a known environment variable
* @*
* @bullet{} @code{canonicalize_file_name} or @code{realpath} return
* errors (cannot resolve the resulting path).
=*/
bool
optionMakePath(char * p_buf, int b_sz, char const * fname, char const * prg_path)
{
{
size_t len = strlen(fname);
if (((size_t)b_sz <= len) || (len == 0))
return false;
}
/*
* IF not an environment variable, just copy the data
*/
if (*fname != '$') {
char const * src = fname;
char * dst = p_buf;
int ct = b_sz;
for (;;) {
if ( (*(dst++) = *(src++)) == NUL)
break;
if (--ct <= 0)
return false;
}
}
/*
* IF the name starts with "$$", then it must be "$$" or
* it must start with "$$/". In either event, replace the "$$"
* with the path to the executable and append a "/" character.
*/
else switch (fname[1]) {
case NUL:
return false;
case '$':
if (! add_prog_path(p_buf, b_sz, fname, prg_path))
return false;
break;
case '@':
if (program_pkgdatadir[0] == NUL)
return false;
if (snprintf(p_buf, (size_t)b_sz, "%s%s",
program_pkgdatadir, fname + 2) >= b_sz)
return false;
break;
default:
if (! add_env_val(p_buf, b_sz, fname))
return false;
}
return get_realpath(p_buf, b_sz);
}
/*=export_func optionMakePath
* private:
*
* what: translate and construct a path
* arg: + char* + pzBuf + The result buffer +
* arg: + int + bufSize + The size of this buffer +
* arg: + char const* + pzName + The input name +
* arg: + char const* + pzProgPath + The full path of the current program +
*
* ret-type: bool
* ret-desc: true if the name was handled, otherwise false.
* If the name does not start with ``$'', then it is handled
* simply by copying the input name to the output buffer and
* resolving the name with either
* @code{canonicalize_file_name(3GLIBC)} or @code{realpath(3C)}.
*
* doc:
*
* This routine will copy the @code{pzName} input name into the
* @code{pzBuf} output buffer, not exceeding @code{bufSize} bytes. If the
* first character of the input name is a @code{'$'} character, then there
* is special handling:
* @*
* @code{$$} is replaced with the directory name of the @code{pzProgPath},
* searching @code{$PATH} if necessary.
* @*
* @code{$@} is replaced with the AutoGen package data installation directory
* (aka @code{pkgdatadir}).
* @*
* @code{$NAME} is replaced by the contents of the @code{NAME} environment
* variable. If not found, the search fails.
*
* Please note: both @code{$$} and @code{$NAME} must be at the start of the
* @code{pzName} string and must either be the entire string or be followed
* by the @code{'/'} (backslash on windows) character.
*
* err: @code{false} is returned if:
* @*
* @bullet{} The input name exceeds @code{bufSize} bytes.
* @*
* @bullet{} @code{$$}, @code{$@@} or @code{$NAME} is not the full string
* and the next character is not '/'.
* @*
* @bullet{} libopts was built without PKGDATADIR defined and @code{$@@}
* was specified.
* @*
* @bullet{} @code{NAME} is not a known environment variable
* @*
* @bullet{} @code{canonicalize_file_name} or @code{realpath} return
* errors (cannot resolve the resulting path).
=*/
bool
optionMakePath(char * pzBuf, int bufSize, char const * pzName,
char const * pzProgPath)
{
size_t name_len = strlen(pzName);
if (((size_t)bufSize <= name_len) || (name_len == 0))
return false;
/*
* IF not an environment variable, just copy the data
*/
if (*pzName != '$') {
char const* pzS = pzName;
char* pzD = pzBuf;
int ct = bufSize;
for (;;) {
if ( (*(pzD++) = *(pzS++)) == NUL)
break;
if (--ct <= 0)
return false;
}
}
/*
* IF the name starts with "$$", then it must be "$$" or
* it must start with "$$/". In either event, replace the "$$"
* with the path to the executable and append a "/" character.
*/
else switch (pzName[1]) {
case NUL:
return false;
case '$':
if (! add_prog_path(pzBuf, bufSize, pzName, pzProgPath))
return false;
break;
case '@':
if (program_pkgdatadir[0] == NUL)
return false;
if (snprintf(pzBuf, bufSize, "%s%s", program_pkgdatadir, pzName + 2)
>= bufSize)
return false;
break;
default:
if (! add_env_val(pzBuf, bufSize, pzName))
return false;
}
#if defined(HAVE_CANONICALIZE_FILE_NAME)
{
char * pz = canonicalize_file_name(pzBuf);
if (pz == NULL)
return false;
name_len = strlen(pz);
if (name_len >= (size_t)bufSize) {
free(pz);
return false;
}
memcpy(pzBuf, pz, name_len + 1);
free(pz);
}
#elif defined(HAVE_REALPATH)
{
char z[PATH_MAX+1];
if (realpath(pzBuf, z) == NULL)
return false;
name_len = strlen(z);
if (name_len >= bufSize)
return false;
memcpy(pzBuf, z, name_len + 1);
}
#endif
return true;
}
