ucx: ucx/buffer.c@abae4669fba7 (annotated)

ucx/buffer.c@abae4669fba7 (annotated)

ucx/buffer.c

Wed, 10 Oct 2012 09:54:57 +0200

author: Mike Becker <universe@uap-core.de>
date: Wed, 10 Oct 2012 09:54:57 +0200
changeset 60: abae4669fba7
parent 58: ucx/memstream.c@733f22fca61a
child 61: fb07a0ab9a17
permissions: -rw-r--r--

renamed UcxMemstream to UcxBuffer

 #include "buffer.h"
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 struct UcxBuffer {
     void *space;
     off_t pos;
     size_t length;
     _Bool autofree;
 };
 UcxBuffer *ucx_buffer_new(void *space, size_t length) {
     UcxBuffer *buffer = (UcxBuffer*) malloc(sizeof(UcxBuffer));
     if (buffer) {
         if (!space) {
             buffer->space = malloc(length);
             if (!buffer->space) {
                 free(buffer);
                 return NULL;
             }
             memset(buffer->space, 0, length);
             buffer->autofree = 1;
         } else {
             buffer->space = space;
             buffer->autofree = 0;
         }
         buffer->length = length;
         buffer->pos = 0;
     }
     return buffer;
 }
 void ucx_buffer_free(UcxBuffer *buffer) {
     if (buffer->autofree) {
         free(buffer->space);
     }
     free(buffer);
 }
 int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence) {
     off_t npos;
     switch (whence) {
     case SEEK_SET:
         npos = 0;
         break;
     case SEEK_CUR:
         npos = buffer->pos;
         break;
     case SEEK_END:
         npos = strlen(buffer->space);
         break;
     }
     npos += offset;
     if (npos < 0 || npos > buffer->length) {
         return -1;
     } else {
         buffer->pos = npos;
         return 0;
     }
 }
 int ucx_buffer_eof(UcxBuffer *buffer) {
     return buffer->pos >= buffer->length;
 }
 size_t ucx_buffer_tell(UcxBuffer *buffer) {
     return buffer->pos;
 }
 size_t ucx_bufio(void* d, size_t s, size_t n, UcxBuffer *b, _Bool read) {
     size_t len;
     if (b->pos + s*n > b->length) {
         len = b->length - b->pos;
         if (s > 1) len -= len%s;
     } else {
         len = s*n;
     }
     if (len == 0) {
         return 0;
     }
     if (read) {
         memcpy(d, (char*)b->space+b->pos, len);
     } else {
         memcpy((char*)b->space+b->pos, d, len);
     }
     b->pos += len;
     return len;
 }
 int ucx_buffer_putc(UcxBuffer *buffer, int c) {
     if (ucx_buffer_eof(buffer)) {
         return EOF;
     } else {
         c &= 0xFF;
         ((char*)(buffer->space))[buffer->pos] = (char) c;
         buffer->pos++;
         return c;
     }
 }
 int ucx_buffer_getc(UcxBuffer *buffer) {
     if (ucx_buffer_eof(buffer)) {
         return EOF;
     } else {
         int c = ((char*)(buffer->space))[buffer->pos];
         buffer->pos++;
         return c;
     }
 }

Mercurial > hg > ucx / annotate

ucx/buffer.c@abae4669fba7 (annotated)

ucx/buffer.c