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/*
* ========================================================================
* Copyright 2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*
* Program: file reading routines
*
*/
/*
* The routines in this file read and write ASCII files from the disk. All of
* the knowledge about files are here. A better message writing scheme should
* be used.
*/
#include "headers.h"
#include "../pith/charconv/filesys.h"
#if defined(bsd) || defined(lnx)
#ifndef errno
extern int errno;
#endif
#endif
FIOINFO g_pico_fio;
/*
* Open a file for reading.
*/
int
ffropen(char *fn)
{
int status;
if ((status = fexist(g_pico_fio.name = fn, "r", (off_t *)NULL)) == FIOSUC){
g_pico_fio.flags = FIOINFO_READ;
if((g_pico_fio.fp = our_fopen(g_pico_fio.name, "r")) == NULL)
status = FIOFNF;
}
return (status);
}
/*
* Write a line to the already opened file. The "buf" points to the buffer,
* and the "nbuf" is its length, less the free newline. Return the status.
* Check only at the newline.
*/
int
ffputline(CELL buf[], int nbuf)
{
register int i;
EML eml;
for(i = 0; i < nbuf; ++i)
if(write_a_wide_char((UCS) buf[i].c, g_pico_fio.fp) == EOF)
break;
if(i == nbuf)
write_a_wide_char((UCS) '\n', g_pico_fio.fp);
if(ferror(g_pico_fio.fp)){
eml.s = errstr(errno);
emlwwrite(_("Write error: %s"), &eml);
sleep(5);
return FIOERR;
}
return FIOSUC;
}
/*
* Read a line from a file, and store the bytes in the supplied buffer. The
* "nbuf" is the length of the buffer. Complain about long lines and lines
* at the end of the file that don't have a newline present. Check for I/O
* errors too. Return status.
*
* Translate the line from the user's locale charset to UCS-4.
*/
int
ffgetline(UCS buf[], size_t nbuf, size_t *charsreturned, int msg)
{
size_t i;
UCS ucs;
static int displayed = 0;
if(charsreturned)
*charsreturned = 0;
i = 0;
while((ucs = read_a_wide_char(g_pico_fio.fp, input_cs)) != CCONV_EOF && ucs != '\n'){
/*
* Don't blat the CR should the newline be CRLF and we're
* running on a unix system. NOTE: this takes care of itself
* under DOS since the non-binary open turns newlines into '\n'.
*/
if(ucs == '\r'){
if((ucs = read_a_wide_char(g_pico_fio.fp, input_cs)) == CCONV_EOF || ucs == '\n')
break;
if(i < nbuf-2) /* Bare CR. Insert it and go on... */
buf[i++] = '\r'; /* else, we're up a creek */
}
if(i >= nbuf-2){
buf[nbuf - 2] = ucs; /* store last char read */
buf[nbuf - 1] = '\0'; /* and terminate it */
if(charsreturned)
*charsreturned = nbuf - 1;
if(msg && displayed == 0){
emlwrite("File has long line", NULL);
displayed = 1;
}
return FIOLNG;
}
buf[i++] = ucs;
}
if(ucs == CCONV_EOF){
if(ferror(g_pico_fio.fp)){
emlwrite("File read error", NULL);
if(charsreturned)
*charsreturned = i;
return FIOERR;
}
if(i != 0)
emlwrite("File doesn't end with newline. Adding one.", NULL);
else{
if(charsreturned)
*charsreturned = i;
return FIOEOF;
}
}
buf[i] = '\0';
if(charsreturned)
*charsreturned = i;
return FIOSUC;
}
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