From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ramkumar Ramachandra Subject: [PATCH 4/6] Add stream helper library Date: Fri, 4 Jun 2010 15:26:26 +0200 Message-ID: <1275657988-29765-5-git-send-email-artagnon@gmail.com> References: <1275657988-29765-1-git-send-email-artagnon@gmail.com> Cc: David Michael Barr , Jonathan Nieder , Sverre Rabbelier , Junio C Hamano To: "Git Mailing List" X-From: git-owner@vger.kernel.org Fri Jun 04 15:25:41 2010 connect(): No such file or directory Return-path: Envelope-to: gcvg-git-2@lo.gmane.org Received: from vger.kernel.org ([209.132.180.67]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1OKWu1-0005qy-8B for gcvg-git-2@lo.gmane.org; Fri, 04 Jun 2010 15:25:37 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932071Ab0FDNZY (ORCPT ); Fri, 4 Jun 2010 09:25:24 -0400 Received: from mail-ew0-f223.google.com ([209.85.219.223]:54197 "EHLO mail-ew0-f223.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754168Ab0FDNZR (ORCPT ); Fri, 4 Jun 2010 09:25:17 -0400 Received: by mail-ew0-f223.google.com with SMTP id 23so308388ewy.1 for ; Fri, 04 Jun 2010 06:25:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:cc:subject:date :message-id:x-mailer:in-reply-to:references; bh=XEnBbhOI971zpeMc8dyENOi5YQ/U5Nw6Qd9/UyROK5k=; b=jdBPYrwUNW5/MaNpxsEfsu6qLkA1m3upgndmWaaMFnT8slAGSiAZ46kAg9hmZBLEXG vSbdZWwSu8sF+cOYqmMHnN2fnCJqm8AdKX6L9ET+zS/E6oAHyvzQbgfXBKL8Nnk+c9ur JJQUISm/0kSNYVOYhko9Lsx84kub1zCgXjUwY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=jkWa7ylqOHxfaD7D1EPgZUtuMFDcUgVIpO8vjAvnmzwAIm0fIUmo5hNSI0sLVsoMKT GdTaegmzk7xE2ReMiD8zs36MOB1ruHfuuKGM11o0TMTK3PMog8apj0jxRVa5IUENN+tN YyeKffiaiXqQjlc+v70ypgoHv1DB+9xZpLb0I= Received: by 10.213.12.196 with SMTP id y4mr8403810eby.89.1275657916246; Fri, 04 Jun 2010 06:25:16 -0700 (PDT) Received: from localhost (nat-wireless.itu.dk [130.226.142.243]) by mx.google.com with ESMTPS id 16sm720320ewy.15.2010.06.04.06.25.14 (version=TLSv1/SSLv3 cipher=RC4-MD5); Fri, 04 Jun 2010 06:25:15 -0700 (PDT) X-Mailer: git-send-email 1.7.1 In-Reply-To: <1275657988-29765-1-git-send-email-artagnon@gmail.com> Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: This library provides facilities to read streams into buffers. It maintains a couple of static buffers and provides an API to use them. Signed-off-by: David Barr Signed-off-by: Ramkumar Ramachandra --- vcs-svn/line_buffer.c | 129 +++++++++++++++++++++++++++++++++++++++++++++++++ vcs-svn/line_buffer.h | 14 +++++ 2 files changed, 143 insertions(+), 0 deletions(-) create mode 100644 vcs-svn/line_buffer.c create mode 100644 vcs-svn/line_buffer.h diff --git a/vcs-svn/line_buffer.c b/vcs-svn/line_buffer.c new file mode 100644 index 0000000..740676d --- /dev/null +++ b/vcs-svn/line_buffer.c @@ -0,0 +1,129 @@ +#include "git-compat-util.h" + +#include "line_buffer.h" +#include "obj_pool.h" + +#define LINE_BUFFER_LEN 10000 +#define COPY_BUFFER_LEN 4096 + +/* Create memory pool for char sequence of known length */ +obj_pool_gen(blob, char, 4096); + +static char line_buffer[LINE_BUFFER_LEN]; +static char byte_buffer[COPY_BUFFER_LEN]; +static uint32_t line_buffer_len = 0; +static uint32_t line_len = 0; +static FILE *infile; + +int buffer_init(char *filename) +{ + infile = fopen(filename, "r"); + if (!infile) + return 1; + return 0; +} + +int buffer_deinit() +{ + fclose(infile); + return 0; +} + +char *buffer_read_line(void) +{ + char *end; + uint32_t n_read; + + if (line_len) { + memmove(line_buffer, &line_buffer[line_len], + line_buffer_len - line_len); + line_buffer_len -= line_len; + line_len = 0; + } + + end = memchr(line_buffer, '\n', line_buffer_len); + while (line_buffer_len < LINE_BUFFER_LEN - 1 && + !feof(infile) && ferror(infile) && NULL == end) { + n_read = fread(&line_buffer[line_buffer_len], 1, + LINE_BUFFER_LEN - 1 - line_buffer_len, + infile); + end = memchr(&line_buffer[line_buffer_len], '\n', n_read); + line_buffer_len += n_read; + } + + if (ferror(infile)) + return NULL; + + if (end != NULL) { + line_len = end - line_buffer; + line_buffer[line_len++] = '\0'; + } else { + line_len = line_buffer_len; + line_buffer[line_buffer_len] = '\0'; + } + + if (line_len == 0) + return NULL; + + return line_buffer; +} + +char *buffer_read_string(uint32_t len) +{ + char *s; + blob_free(blob_pool.size); + s = blob_pointer(blob_alloc(len + 1)); + uint32_t offset = 0; + if (line_buffer_len > line_len) { + offset = line_buffer_len - line_len; + if (offset > len) + offset = len; + memcpy(s, &line_buffer[line_len], offset); + line_len += offset; + } + if (offset < len) + offset += fread(&s[offset], 1, len - offset, infile); + s[offset] = '\0'; + return s; +} + +void buffer_copy_bytes(uint32_t len) +{ + uint32_t in; + if (line_buffer_len > line_len) { + in = line_buffer_len - line_len; + if (in > len) + in = len; + fwrite(&line_buffer[line_len], 1, in, stdout); + len -= in; + line_len += in; + } + while (len > 0 && !feof(infile)) { + in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN; + in = fread(byte_buffer, 1, in, infile); + len -= in; + fwrite(byte_buffer, 1, in, stdout); + } +} + +void buffer_skip_bytes(uint32_t len) +{ + uint32_t in; + if (line_buffer_len > line_len) { + in = line_buffer_len - line_len; + if (in > len) + in = len; + line_len += in; + len -= in; + } + while (len > 0 && !feof(infile) && !ferror(infile)) { + in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN; + in = fread(byte_buffer, 1, in, infile); + len -= in; + } +} + +void buffer_reset(void) +{ + blob_reset(); +} diff --git a/vcs-svn/line_buffer.h b/vcs-svn/line_buffer.h new file mode 100644 index 0000000..a6c42d7 --- /dev/null +++ b/vcs-svn/line_buffer.h @@ -0,0 +1,14 @@ +#ifndef LINE_BUFFER_H_ +#define LINE_BUFFER_H_ + +#include + +int buffer_init(char *filename); +int buffer_deinit(void); +char *buffer_read_line(void); +char *buffer_read_string(uint32_t len); +void buffer_copy_bytes(uint32_t len); +void buffer_skip_bytes(uint32_t len); +void buffer_reset(void); + +#endif -- 1.7.1