Initial version of Cgraph created.

diff --git a/lib/cgraph/io.c b/lib/cgraph/io.c
new file mode 100644 (file)
index 0000000..3b93f0e
--- /dev/null
+++ b/lib/cgraph/io.c
@@ -0,0 +1,87 @@
+/* $Id$ $Revision$ */
+/* vim:set shiftwidth=4 ts=8: */
+
+/**********************************************************
+*      This software is part of the graphviz package      *
+*                http://www.graphviz.org/                 *
+*                                                         *
+*            Copyright (c) 1994-2004 AT&T Corp.           *
+*                and is licensed under the                *
+*            Common Public License, Version 1.0           *
+*                      by AT&T Corp.                      *
+*                                                         *
+*        Information and Software Systems Research        *
+*              AT&T Research, Florham Park NJ             *
+**********************************************************/
+
+#include <stdio.h>
+#include <cghdr.h>
+
+/* experimental ICONV code - probably should be removed - JCE */
+#undef HAVE_ICONV
+
+#ifdef HAVE_ICONV
+#include <iconv.h>
+#include <langinfo.h>
+#include <errno.h>
+#endif
+
+#ifdef HAVE_ICONV
+static int iofreadiconv(void *chan, char *buf, int bufsize)
+{
+#define CHARBUFSIZE 30
+    static char charbuf[CHARBUFSIZE];
+    static iconv_t cd = NULL;
+    char *inbuf, *outbuf, *readbuf;
+    size_t inbytesleft, outbytesleft, readbytesleft, resbytes, result;
+    int fd;
+
+    if (!cd) {
+       cd = iconv_open(nl_langinfo(CODESET), "UTF-8");
+    }
+    fd = fileno((FILE *) chan);
+    readbuf = inbuf = charbuf;
+    readbytesleft = CHARBUFSIZE;
+    inbytesleft = 0;
+    outbuf = buf;
+    outbytesleft = bufsize - 1;
+    while (1) {
+       if ((result = read(fd, readbuf++, 1)) != 1)
+           break;
+       readbytesleft--;
+       inbytesleft++;
+       result = iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
+       if (result != -1) {
+           readbuf = inbuf = charbuf;
+           readbytesleft = CHARBUFSIZE;
+           inbytesleft = 0;
+       } else if (errno != EINVAL)
+           break;
+    }
+    *outbuf = '\0';
+    resbytes = bufsize - 1 - outbytesleft;
+    if (resbytes)
+       result = resbytes;
+    return result;
+}
+#endif
+
+static int iofread(void *chan, char *buf, int bufsize)
+{
+    return read(fileno((FILE *) chan), buf, bufsize);
+    /* return fread(buf, 1, bufsize, (FILE*)chan); */
+}
+
+/* default IO methods */
+static int ioputstr(void *chan, char *str)
+{
+    return fputs(str, (FILE *) chan);
+}
+
+static int ioflush(void *chan)
+{
+    return fflush((FILE *) chan);
+}
+
+/* Agiodisc_t AgIoDisc = { iofreadiconv, ioputstr, ioflush }; */
+Agiodisc_t AgIoDisc = { iofread, ioputstr, ioflush };