NEW EDIT: Basically I've provided a example that isn't correct. In my real application the string will of course not always be "C:/Users/Familjen-Styren/Documents/V\u00E5gformer/20140104-0002/text.txt". Instead I will have a input window in java and then I will "escape" the unicode characters to a universal character name. And then it will be "unescaped" in C (I do this to avoid problems with passing multibyte characters from java to c). So here is a example where I actually ask the user to input a string (filename):
#include <stdio.h>
#include <string.h>
int func(const char *fname);
int main()
{
char src[100];
scanf("%s", &src);
printf("%s\n", src);
int exists = func((const char*) src);
printf("Does the file exist? %d\n", exists);
return exists;
}
int func(const char *fname)
{
FILE *file;
if (file = fopen(fname, "r"))
{
fclose(file);
return 1;
}
return 0;
}
And now it will think the universal character names is just a part of the actual filename. So how do I "unescape" the universal character names included in the input?
FIRST EDIT: So I compile this example like this: "gcc -std=c99 read.c" where 'read.c' is my source file. I need the -std=c99 parameter because I'm using the prefix '\u' for my universal character name. If I change it to '\x' it works fine, and I can remove the -std=c99 parameter. But in my real application the input will not use the prefix '\x' instead it will be using the prefix '\u'. So how do I work around this?
This code gives the desired result but for my real application I can't really use '\x':
#include <stdio.h>
#include <string.h>
int func(const char *fname);
int main()
{
char *src = "C:/Users/Familjen-Styren/Documents/V\x00E5gformer/20140104-0002/text.txt";
int exists = func((const char*) src);
printf("Does the file exist? %d\n", exists);
return exists;
}
int func(const char *fname)
{
FILE *file;
if (file = fopen(fname, "r"))
{
fclose(file);
return 1;
}
return 0;
}
ORIGINAL: I've found a few examples of how to do this in other programming languages like javascript but I couldn't find any example on how to do this in C. Here is a sample code which produces the same error:
#include <stdio.h>
#include <string.h>
int func(const char *fname);
int main()
{
char *src = "C:/Users/Familjen-Styren/Documents/V\u00E5gformer/20140104-0002/text.txt";
int len = strlen(src); /* This returns 68. */
char fname[len];
sprintf(fname,"%s", src);
int exists = func((const char*) src);
printf("%s\n", fname);
printf("Does the file exist? %d\n", exists); /* Outputs 'Does the file exist? 0' which means it doesn't exist. */
return exists;
}
int func(const char *fname)
{
FILE *file;
if (file = fopen(fname, "r"))
{
fclose(file);
return 1;
}
return 0;
}
If I instead use the same string without universal character names:
#include <stdio.h>
#include <string.h>
int func(const char *fname);
int main()
{
char *src = "C:/Users/Familjen-Styren/Documents/Vågformer/20140104-0002/text.txt";
int exists = func((const char*) src);
printf("Does the file exist? %d\n", exists); /* Outputs 'Does the file exist? 1' which means it does exist. */
return exists;
}
int func(const char *fname)
{
FILE *file;
if (file = fopen(fname, "r"))
{
fclose(file);
return 1;
}
return 0;
}
it will output 'Does the file exist? 1'. Which means it does indeed exist. But the problem is I need to be able to handle universal character. So how do I unescape a string which contains universal character names?
Thanks in advance.
