mh_ctx.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Mailutils is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* MH context functions. */
#include <mh.h>
#include <sys/types.h>
#include <sys/stat.h>
mh_context_t *
mh_context_create (char *name, int copy)
{
mh_context_t *ctx;
ctx = malloc (sizeof (*ctx));
if (!ctx)
mh_err_memory (1);
if (copy)
ctx->name = name;
else
{
ctx->name = strdup (name);
if (!ctx->name)
mh_err_memory (1);
}
ctx->header = NULL;
return ctx;
}
int
mh_context_read (mh_context_t *ctx)
{
int status;
char *blurb;
struct stat st;
FILE *fp;
if (stat (ctx->name, &st))
return errno;
blurb = malloc (st.st_size);
if (!blurb)
return ENOMEM;
fp = fopen (ctx->name, "r");
if (!fp)
{
free (blurb);
return errno;
}
fread (blurb, st.st_size, 1, fp);
fclose (fp);
if ((status = header_create (&ctx->header, blurb, st.st_size, NULL)) != 0)
free (blurb);
return status;
}
int
mh_context_write (mh_context_t *ctx)
{
stream_t stream;
char buffer[512];
size_t off = 0, n;
FILE *fp;
fp = fopen (ctx->name, "w");
if (!fp)
{
mh_error (_("can't write context file %s: %s"),
ctx->name, strerror (errno));
return 1;
}
header_get_stream (ctx->header, &stream);
while (stream_read (stream, buffer, sizeof buffer - 1, off, &n) == 0
&& n != 0)
{
buffer[n] = '\0';
fprintf (fp, "%s", buffer);
off += n;
}
fclose (fp);
return 0;
}
/* FIXME: mh_context_get_value returns a pointer to the allocated memory.
Instead, it should return a const pointer to the static storage within
the header_t structure and be declared as
`const char *mh_context_get_value()'. Current implementation of
header_.* functions does not allow that.
This has two drawbacks:
1) The function is declared as returning char * instead of
intended const char *.
2) Ugly typecast when returning defval. */
char *
mh_context_get_value (mh_context_t *ctx, const char *name, const char *defval)
{
char *p;
if (header_aget_value (ctx->header, name, &p))
p = (char *) defval;
return p;
}
int
mh_context_set_value (mh_context_t *ctx, const char *name, const char *value)
{
if (!ctx->header)
{
int rc;
if ((rc = header_create (&ctx->header, NULL, 0, NULL)) != 0)
{
mh_error (_("Can't create context %s: %s"),
ctx->name,
mu_strerror (rc));
return 1;
}
}
return header_set_value (ctx->header, name, value, 1);
}