cscvs to tla changeset 27

[onak.git] / charfuncs.c

diff --git a/charfuncs.c b/charfuncs.c
new file mode 100644 (file)
index 0000000..de68b66
--- /dev/null
+++ b/charfuncs.c
@@ -0,0 +1,81 @@
+/*
+ * charfuncs.c - Routines for dealing with character streams.
+ *
+ * Jonathan McDowell <noodles@earth.li>
+ *
+ * Copyright 2002 Project Purple
+ */
+
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <unistd.h>
+
+#include "charfuncs.h"
+
+/**
+ *     buffer_fetchchar - Fetches a char from a buffer.
+ *     @ctx: Our buffer context structure.
+ *     @count: The number of characters to get from the buffer.
+ *     @c: Where to put the characters retrieved.
+ */
+int buffer_fetchchar(void *ctx, size_t count, unsigned char *c)
+{
+       struct buffer_ctx *buf = NULL;
+       int i;
+       
+       buf = (struct buffer_ctx *) ctx;
+       for (i = 0; i < count; i++) {
+               c[i] = buf->buffer[buf->offset++];
+       }
+
+       return (((buf->offset) == (buf->size)) ? 1 : 0);
+}
+
+/**
+ *     buffer_putchar - Puts a char to a buffer.
+ *     @ctx: Our buffer context structure.
+ *     @count: The number of characters to put into the buffer.
+ *     @c: The characters to add to the buffer.
+ *
+ *     Adds characters to the buffer references by the buffer context. If we
+ *     fill it then we double the size of the current buffer and then add the
+ *     rest.
+ */
+int buffer_putchar(void *ctx, size_t count, unsigned char *c)
+{
+       struct buffer_ctx *buf = NULL;
+       size_t newsize = 0;
+       int i;
+       
+       buf = (struct buffer_ctx *) ctx;
+
+       for (newsize = buf->size; newsize < (buf->offset + count);
+                       newsize *= 2) ;
+
+       if (newsize != buf->size) {
+               buf->buffer = realloc(buf->buffer, newsize);
+               buf->size = newsize;
+       }
+       
+       for (i = 0; i < count; i++) {
+               buf->buffer[buf->offset++] = c[i];
+       }
+
+       return 1;
+}
+
+/**
+ *     file_fetchchar - Fetches a char from a file.
+ */
+int file_fetchchar(void *fd, size_t count, unsigned char *c)
+{
+       return !(read( *(int *) fd, c, count));
+}
+
+/**
+ *     file_putchar - Puts a char to a file.
+ */
+int file_putchar(void *fd, size_t count, unsigned char *c)
+{
+       return !(write( *(int *) fd, c, count));
+}