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a set of functions for Case-insensitive test


From: Benoît Rouits
Subject: a set of functions for Case-insensitive test
Date: Mon, 30 Jul 2001 12:15:35 +0200

Hello !
As i worked on some problems due to  win32 CVS Clients with
case insensitive tests,
I made a small set of functions to test -Case insensitivly-
the presence of a file
in an Un*x server. I think it would be good to integrate it in
the parts of code
where there are stat() or other access to files, embedded by a
 #ifdef CASE_INSENSITIVE
Or, if you don't want to manage win32 problems, tell about
this problem in the doc !
Cheers, Ben
(please CC replies to address@hidden since i unsubscribed
from cvs-bug, thanks.)
-- 
     Benoit Rouits     | Tel : (+33) 1 4922 7719
Free Software Engineer | http://www.alcove.com
/*give the directory and the filename extracted from the path*/
/* in : "path". out : "directory", "filename" (must be malloc'd) */
#define SEPARATOR '/'
#define MAXLEN 256
void basename(directory,filename,path)
    char *directory;
    char *filename;
    char *path;
{
    /* reverse a string */
    /* in : "str". out : "rev" (must be malloc'd) */
    void s_reverse(rev, str)
        char *rev;
        char *str;
    {
        int i;
        for (i=strlen(str)-1;i>=0;i--)
        {
            rev[strlen(str)-i-1]=str[i];
        }
        rev[strlen(str)]='\0';
    }

    int i;
    char rev_path[MAXLEN];
    char rev_file[MAXLEN];
    char rev_dir[MAXLEN];
    /* first, we reverse the path string to parse */
    s_reverse(rev_path,path);
    i=0;
    /* extract filename (reversed) */
    while (rev_path[i] != SEPARATOR && i < strlen(rev_path))
    {
        rev_file[i]=rev_path[i];
        i++;
    }
    rev_file[i]='\0';
    s_reverse(filename, rev_file);
    /* extract directory (reversed) */
    while (i < strlen(rev_path))
    {
        rev_dir[i-strlen(rev_file)]=rev_path[i+1];
        i++;
    }
    rev_dir[strlen(rev_path)-strlen(rev_file)]='\0';
    s_reverse(directory, rev_dir);
}
/* gives "filename" that exists in "directory" with CASE INSENSITIVE TEST*/
/* in : "file", "directory". out :"return-fname" (must be malloc'd) */
/* return : 1 if filename exists (CASE INSENSITIVE), 0 if not */
int case_insensitive_exist(return_fname ,directory, file)
    char *return_fname;
    char *directory;
    char *file;
{
    int exist = 0;
    struct dirent *d_ent; /* need of <dirent.h> */
    DIR *dp;
        
    /* Converts a string s into upper-case string dest. Need of <ctype.h> */
    /* Warning : you must malloc "dest" ! */
    void s_toupper(dest,s)
        char *dest;
        char *s;
    {
        int i;
                
        for (i=0;i<=strlen(s);i++)
        {
            dest[i]=(char)toupper((int)s[i]);
        }
    }
    /* open directory*/
    dp=opendir(directory);
    if (dp)
    {
        char upper_d_name[MAXLEN];
        char upper_file[MAXLEN];
        /* list directory */
        while (d_ent=readdir(dp))
        {   /* compare case-insensitive */
            s_toupper(upper_d_name,d_ent->d_name);
            s_toupper(upper_file, file);
            if (!strcmp(upper_d_name,upper_file))
            {
                exist=1;
                break;
            }
        }
    }
    if (exist)
    {
        strcpy (return_fname,d_ent->d_name);
        return 1;
    }
    else
    {
        strcpy(return_fname,file);
        return 0;
    }
}

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