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/*
netrik -- The ANTRIK Internet Viewer
Copyright (C) Olaf D. Buddenhagen AKA antrik, et al (see AUTHORS)
Published under the GNU GPL; see LICENSE for details.
*/
/*
* form-file.c -- file handling for "textarea" and "file" form controls
*
* (C) 2003 antrik
*/
#include <ctype.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "form-file.h"
enum File_err {
ERR_NO=0,
ERR_OPEN,
ERR_SIZE,
ERR_READ
};
static enum File_err read_file(const char *file_name, struct Data_string *value);
/*
* Read file into memory.
*
* The file file_named "file_name" is opened and its content read into a newly
* malloced buffer; this buffer is stored in the "value" data string.
*
* If some error occured while reading the file, an appropriate error code is
* returned.
*/
static enum File_err read_file(file_name, value)
const char *file_name;
struct Data_string *value;
{
int fildes;
struct stat stat_buf;
int size;
char *data;
fildes=open(file_name, O_RDONLY);
if(fildes==-1) {
unlink(file_name);
return ERR_OPEN;
}
if(fstat(fildes, &stat_buf)==-1) {
close(fildes);
unlink(file_name);
return ERR_SIZE;
}
size=stat_buf.st_size;
data=malloc(size);
if(read(fildes, data, size)!=size) {
close(fildes);
unlink(file_name);
free(data);
return ERR_READ;
}
close(fildes);
/* store new data */
free(value->data);
value->data=data;
value->size=size;
return ERR_NO;
} /* read file */
/*
* Use external editor to edit the value of a "textarea" form input field.
*
* Creates a temporary file with the old contents of the input field, launches
* editor on that file, and reads new contents back.
*
* If some error occured in the system calls, a string describing the error is
* returned; NULL means no error.
*/
char *edit_textarea(value, name)
struct Data_string *value;
char *name;
{
/* external editor to use */
char *editor;
editor=getenv("EDITOR");
if(editor==NULL)
editor="vi";
if(!name)
name="";
/* write file/edit/read file */
{
/* get temp file name */
static const char format[]="netrik-textarea-%s-XXXXXX";
const int size=sizeof(format)+strlen(name);
char temp_name[size];
snprintf(temp_name, size, format, name);
/* make sure we get a proper filename */
{
char *chr;
for(chr=temp_name; *chr; ++chr)
if(!isalnum(*chr)) /* not safe filename char -> replace */
*chr='_';
}
/* write temporary file */
{
int fildes;
fildes=mkstemp(temp_name);
if(fildes==-1) {
return "failed to create temporary file";
}
if(write(fildes, value->data, value->size)!=value->size) {
close(fildes);
unlink(temp_name);
return "failed to write to temporary file";
}
if(close(fildes)==-1) {
unlink(temp_name);
return "failed to close temporary file after writing";
}
}
/* edit/read file */
{
/* get edit command */
static const char format[]="%s %s";
const int size=sizeof(format)+strlen(temp_name)+strlen(editor);
char edit_cmd[size];
snprintf(edit_cmd, size, format, editor, temp_name);
/* edit */
if(system(edit_cmd)!=0) {
unlink(temp_name);
return "invoking editor failed";
}
/* read temporary file */
{
enum File_err error;
error=read_file(temp_name, value);
switch(error) {
case ERR_NO: break;
case ERR_OPEN: return "failed to reopen temporary file";
case ERR_SIZE: return "failed to get file size";
case ERR_READ: return "failed to read from temporary file";
}
} /* read file */
} /* edit/read file */
unlink(temp_name);
} /* write file/edit/read file */
return NULL; /* no error */
}
/*
* Read a file into memory.
*
* The file contents is stored in a data string which is returned to the
* caller.
*
* If some error occured while reading the file, the "size" attribute of the
* data string is set to -1 to indicate no valid data.
*/
struct Data_string form_read_file(file_name)
const char *file_name;
{
struct Data_string value={NULL, 0};
enum File_err error;
error=read_file(file_name, &value);
if(error!=ERR_NO) {
static const char *err_str[]={
"", /* ERR_NO */
"open",
"get size of",
"read from"
};
fprintf(stderr, "\n\nfailed to %s file \"%s\" (to be submitted with form)\n", err_str[error], file_name);
value.size=-1;
}
return value;
}
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