X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/b817bfc642225b8c3c0b6a7e42d1fb949b61a606..50c46275b6a5100b020493adbd27bc361704ffda:/buf.c diff --git a/buf.c b/buf.c index 3a09365..0cdb91d 100644 --- a/buf.c +++ b/buf.c @@ -1,6 +1,6 @@ /* -*-c-*- * - * $Id: buf.c,v 1.4 2004/04/08 01:36:15 mdw Exp $ + * $Id$ * * Buffer handling * @@ -37,214 +37,6 @@ /*----- Main code ---------------------------------------------------------*/ -/* --- @buf_init@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @void *p@ = pointer to a buffer - * @size_t sz@ = size of the buffer - * - * Returns: --- - * - * Use: Initializes the buffer block appropriately. - */ - -void buf_init(buf *b, void *p, size_t sz) -{ - b->base = b->p = p; - b->limit = b->p + sz; - b->f = 0; -} - -/* --- @buf_break@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * - * Returns: Some negative value. - * - * Use: Marks a buffer as broken. - */ - -int buf_break(buf *b) { b->f |= BF_BROKEN; return (-1); } - -/* --- @buf_flip@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * - * Returns: --- - * - * Use: Flips a buffer so that if you've just been writing to it, - * you can now read from the bit you've written. - */ - -void buf_flip(buf *b) -{ - b->limit = b->p; - b->p = b->base; -} - -/* --- @buf_ensure@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @size_t sz@ = size of data wanted - * - * Returns: Zero if it worked, nonzero if there wasn't enough space. - * - * Use: Ensures that there are @sz@ bytes still in the buffer. - */ - -int buf_ensure(buf *b, size_t sz) { return (BENSURE(b, sz)); } - -/* --- @buf_get@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @size_t sz@ = size of the buffer - * - * Returns: Pointer to the place in the buffer. - * - * Use: Reserves a space in the buffer of the requested size, and - * returns its start address. - */ - -void *buf_get(buf *b, size_t sz) -{ - void *p; - if (BENSURE(b, sz)) - return (0); - p = BCUR(b); - BSTEP(b, sz); - return (p); -} - -/* --- @buf_put@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @const void *p@ = pointer to a buffer - * @size_t sz@ = size of the buffer - * - * Returns: Zero if it worked, nonzero if there wasn't enough space. - * - * Use: Fetches data from some place and puts it in the buffer - */ - -int buf_put(buf *b, const void *p, size_t sz) -{ - if (BENSURE(b, sz)) - return (-1); - memcpy(BCUR(b), p, sz); - BSTEP(b, sz); - return (0); -} - -/* --- @buf_getbyte@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * - * Returns: A byte, or less than zero if there wasn't a byte there. - * - * Use: Gets a single byte from a buffer. - */ - -int buf_getbyte(buf *b) -{ - if (BENSURE(b, 1)) - return (-1); - return (*b->p++); -} - -/* --- @buf_putbyte@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @int ch@ = byte to write - * - * Returns: Zero if OK, nonzero if there wasn't enough space. - * - * Use: Puts a single byte in a buffer. - */ - -int buf_putbyte(buf *b, int ch) -{ - if (BENSURE(b, 1)) - return (-1); - *b->p++ = ch; - return (0); -} - -/* --- @buf_getu16@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @uint16 *w@ = where to put the word - * - * Returns: Zero if OK, or nonzero if there wasn't a word there. - * - * Use: Gets a 16-bit word from a buffer. - */ - -int buf_getu16(buf *b, uint16 *w) -{ - if (BENSURE(b, 2)) - return (-1); - *w = LOAD16(b->p); - BSTEP(b, 2); - return (0); -} - -/* --- @buf_putu16@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @uint16 w@ = word to write - * - * Returns: Zero if OK, nonzero if there wasn't enough space. - * - * Use: Puts a 16-but word in a buffer. - */ - -int buf_putu16(buf *b, uint16 w) -{ - if (BENSURE(b, 2)) - return (-1); - STORE16(b->p, w); - BSTEP(b, 2); - return (0); -} - -/* --- @buf_getu32@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @uint32 *w@ = where to put the word - * - * Returns: Zero if OK, or nonzero if there wasn't a word there. - * - * Use: Gets a 32-bit word from a buffer. - */ - -int buf_getu32(buf *b, uint32 *w) -{ - if (BENSURE(b, 4)) - return (-1); - *w = LOAD32(b->p); - BSTEP(b, 4); - return (0); -} - -/* --- @buf_putu32@ --- * - * - * Arguments: @buf *b@ = pointer to a buffer block - * @uint32 w@ = word to write - * - * Returns: Zero if OK, nonzero if there wasn't enough space. - * - * Use: Puts a 32-but word in a buffer. - */ - -int buf_putu32(buf *b, uint32 w) -{ - if (BENSURE(b, 4)) - return (-1); - STORE32(b->p, w); - BSTEP(b, 4); - return (0); -} - /* --- @buf_getmp@ --- * * * Arguments: @buf *b@ = pointer to a buffer block