netcdf-c/libdispatch/dwinpath.c

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/*
* Copyright 1996, University Corporation for Atmospheric Research
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
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#ifdef _MSC_VER
#include <io.h>
#endif
#include "ncexternl.h"
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#include "ncwinpath.h"
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#undef PATHFORMAT
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/*
Code to provide some path conversion code so that
cygwin and (some) mingw paths can be passed to open/fopen
for Windows. Other cases will be added as needed.
Rules:
1. a leading single alpha-character path element (e.g. /D/...)
will be interpreted as a windows drive letter.
2. a leading '/cygdrive/X' will be converted to
a drive letter X if X is alpha-char.
3. a leading D:/... is treated as a windows drive letter
4. a relative path will be converted to an absolute path.
5. If any of the above is encountered, then forward slashes
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will be converted to backslashes.
All other cases are passed thru unchanged
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*/
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/* Define legal windows drive letters */
static char* windrive = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
static size_t cdlen = 10; /* strlen("/cygdrive/") */
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static int pathdebug = -1;
static char* makeabsolute(const char* relpath);
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EXTERNL
char* /* caller frees */
NCpathcvt(const char* path)
{
char* outpath = NULL;
char* p;
char* q;
size_t pathlen;
if(path == NULL) goto done; /* defensive driving */
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/* Check for path debug env vars */
if(pathdebug < 0) {
const char* s = getenv("NCPATHDEBUG");
pathdebug = (s == NULL ? 0 : 1);
}
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pathlen = strlen(path);
/* 1. look for MSYS path /D/... */
if(pathlen >= 2
&& (path[0] == '/' || path[0] == '\\')
&& strchr(windrive,path[1]) != NULL
&& (path[2] == '/' || path[2] == '\\' || path[2] == '\0')) {
/* Assume this is a mingw path */
outpath = (char*)malloc(pathlen+3); /* conservative */
if(outpath == NULL) goto done;
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q = outpath;
*q++ = path[1];
*q++ = ':';
strncpy(q,&path[2],pathlen);
if(strlen(outpath) == 2)
strcat(outpath,"/");
goto slashtrans;
}
/* 2. Look for leading /cygdrive/D where D is a single-char drive letter */
if(pathlen >= (cdlen+1)
&& memcmp(path,"/cygdrive/",cdlen)==0
&& strchr(windrive,path[cdlen]) != NULL
&& (path[cdlen+1] == '/'
|| path[cdlen+1] == '\\'
|| path[cdlen+1] == '\0')) {
/* Assume this is a cygwin path */
outpath = (char*)malloc(pathlen+1); /* conservative */
if(outpath == NULL) goto done;
outpath[0] = path[cdlen]; /* drive letter */
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outpath[1] = ':';
strcpy(&outpath[2],&path[cdlen+1]);
if(strlen(outpath) == 2)
strcat(outpath,"/");
goto slashtrans;
}
/* 3. Look for leading D: where D is a single-char drive letter */
if(pathlen >= 2
&& strchr(windrive,path[0]) != NULL
&& path[1] == ':'
&& (path[2] == '\0' || path[2] == '/' || path[2] == '\\')) {
outpath = strdup(path);
goto slashtrans;
}
/* 4. Look for relative path */
if(pathlen > 1 && path[0] == '.') {
outpath = makeabsolute(path);
goto slashtrans;
}
/* Other: just pass thru */
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outpath = strdup(path);
goto done;
slashtrans:
/* In order to help debugging, and if not using MSC_VER or MINGW,
convert back slashes to forward, else convert forward to back
*/
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p = outpath;
/* In all #1 or #2 cases, translate '/' -> '\\' */
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for(;*p;p++) {
if(*p == '/') {*p = '\\';}
}
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#ifdef PATHFORMAT
#ifndef _MSC_VER
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p = outpath;
/* Convert '\' back to '/' */
for(;*p;p++) {
if(*p == '\\') {*p = '/';}
}
}
#endif /*!_MSC_VER*/
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#endif /*PATHFORMAT*/
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done:
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if(pathdebug) {
fprintf(stderr,"XXXX: inpath=|%s| outpath=|%s|\n",
path?path:"NULL",outpath?outpath:"NULL");
fflush(stderr);
}
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return outpath;
}
static char*
makeabsolute(const char* relpath)
{
char* path = NULL;
#ifdef _MSC_VER
path = _fullpath(NULL,relpath,8192);
#else
path = realpath(relpath, NULL);
#endif
if(path == NULL)
path = strdup(relpath);
return path;
}
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#ifdef WINPATH
/*
Provide wrappers for open and fopen.
*/
EXTERNL
FILE*
NCfopen(const char* path, const char* flags)
{
FILE* f = NULL;
char* cvtname = NCpathcvt(path);
if(cvtname == NULL) return NULL;
f = fopen(cvtname,flags);
free(cvtname);
return f;
}
EXTERNL
int
NCopen3(const char* path, int flags, int mode)
{
int fd = -1;
char* cvtname = NCpathcvt(path);
if(cvtname == NULL) return -1;
fd = open(cvtname,flags,mode);
free(cvtname);
return fd;
}
EXTERNL
int
NCopen2(const char *path, int flags)
{
return NCopen3(path,flags,0);
}
#endif /*WINPATH*/