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fileexp.cpp
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fileexp.cpp
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#include <stdexcept>
#include <algorithm>
#include "varexp.h"
#include "auto_dir.h"
#if defined(_WIN32)
# include <io.h>
# define F_OK 0
# define X_OK 0
#else
# include <unistd.h>
#endif
#include "fileexp.h"
/*
copyright (c) 2004, 2005, 2015 squell <info@squell.net>
use, modification, copying and distribution of this software is permitted
under the conditions described in the file 'COPYING'.
*/
#if defined(__DJGPP__) || defined(_WIN32)
# define readlink(path, buf, n) (-1) // readlink dummy
#endif
using namespace std;
namespace fileexp {
/* filefind::nested variables split in two categories: stuff that drives the
the recursion (parameters); and supporting information (class members) */
struct filefind : record {
char mask[PATH_MAX];
find* invoker;
char* rec_base; // start of recursive search
class direxp;
bool nested (auto_dir, char* pathpos, char* filespec);
char* pathcpy(char*, const char*); // special strcpy variant
};
bool find::glob(const char* filemask, bool wildslash)
{
filefind t;
strncpy(t.mask, filemask, sizeof t.mask);
t.path[0] = t.mask[sizeof t.mask-1] = '\0'; // duct tape
t.invoker = this;
t.rec_base = wildslash? t.path : 0;
#if defined(_WIN32)
if(strncmp(t.mask, "//", 2) == 0) { // unc path
char* shmask = strchr(t.mask+2, '/');
if(shmask && (shmask=strchr(++shmask, '/'))) {
*shmask++ = '\0'; // separate sharename
char* shpath = t.pathcpy(t.pathcpy(t.path, t.mask), "/");
if(t.rec_base) t.rec_base = shpath;
return t.nested(auto_dir(t.mask), shpath, shmask);
}
return false;
} else
#endif
return t.nested(auto_dir("./"), t.path, t.mask);
}
struct filefind::direxp : varexp { // special dotfile handling
inline static bool is_special(const char* fn)
{
return (fn[0] == '.') && (!fn[1] || fn[1] == '.' && !fn[2]);
}
direxp(const char* mask, const char* test, bool force = false)
{
#if defined(__DJGPP__) || defined(_WIN32)
if(force || !is_special(test))
result = match(mask, test);
else
result = 0;
#else // conform to Bourne shell
if(force || test[0] != '.' || mask[0] == '.')
result = match(mask, test);
else
result = 0;
#endif
}
};
char* filefind::pathcpy(char* dest, const char* src)
{
do { // added safety
if(dest == &path[sizeof path])
throw length_error("filefindexp: pathname error");
} while(*dest++ = *src++);
return dest-1; // return *resume*-ptr
}
struct slash_split {
slash_split(char* p) : ptr(p) { *ptr = '\0'; }
~slash_split() { *ptr = '/'; }
private:
char* ptr;
};
// recursive file search routine, leaves this->mask nonsensical on success
// pathpos - write position (inside path)
// filespec - read position (inside mask)
bool filefind::nested(auto_dir dir, char* pathpos, char* filespec)
{
typedef vector<string> strvec;
strvec::size_type prevlen = var.size(); // backup value
char* wpos; // next write position
bool w = false; // idle check
if(!rec_base || rec_base == pathpos)
while( char* fndirsep = strchr(filespec, '/') ) {
slash_split lock(fndirsep++);
wpos = pathcpy(pathcpy(pathpos, filespec), "/");
if(access(path, X_OK) == 0) {
dir = auto_dir(path); // if allready a valid
pathpos = wpos; // directory, use as is
filespec = fndirsep; // (tail recursion)
if(rec_base) rec_base = pathpos;
} else if(!strpbrk(filespec, "*?[") || !dir) {
return false; // shortcut mismatchers
} else if(rec_base && strchr(filespec,'*')) {
break;
} else {
while( dirent* fn = dir.read() ) { // search cur open dir
direxp match(filespec, fn->d_name);
if(match) {
wpos = pathcpy(pathcpy(pathpos, fn->d_name), "/");
if(rec_base) rec_base = wpos;
if(auto_dir newdir = auto_dir(path)) {
for(varexp::iterator i = match.begin(); i != match.end(); ++i)
var.push_back(*i);
w |= nested(newdir, wpos, fndirsep);
var.resize(prevlen);
}
}
}
return w;
}
}
if(! invoker->dir(*this) )
return false;
if(*filespec == '\0')
return invoker->file(pathpos, *this);
pathcpy(pathpos, filespec); // check if file is 'simple'
if(!strpbrk(filespec, "*?["))
return access(path, F_OK) == 0 && invoker->file(pathpos, *this);
if(! dir ) // we might not have read access
return false;
strvec files;
while( dirent* fn = dir.read() ) { // read all files in dir
if(!direxp::is_special(fn->d_name))
files.push_back(fn->d_name);
}
sort(files.begin(), files.end()); // speeds things up!? wow
for(strvec::iterator fn = files.begin(); fn != files.end(); ++fn) {
wpos = pathcpy(pathpos, fn->c_str());
direxp match(filespec, rec_base? rec_base : pathpos, !!rec_base);
if(match) {
for(varexp::iterator i = match.begin(); i != match.end(); ++i)
var.push_back(*i);
w = true, (void)invoker->file(pathpos, *this);
var.resize(prevlen);
}
}
if(rec_base)
for(strvec::iterator fn = files.begin(); fn != files.end(); ++fn) {
wpos = pathcpy(pathpos, fn->c_str());
auto_dir newdir(path);
char sympath[1]; // dont recurse into symlinks
if(newdir && readlink(path, sympath, sizeof sympath) < 0)
w |= nested(newdir, pathcpy(wpos, "/"), filespec);
}
pathcpy(pathpos, filespec); // try exact match a last resort
return w || access(path, F_OK) == 0 && invoker->file(pathpos, *this);
}
} // namespace