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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: [Patch v5 3/6] util: add gz_readline\r
+Date: Tue, 1 Apr 2014 22:16:18 -0300\r
+Message-Id: <1396401381-18128-4-git-send-email-david@tethera.net>\r
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+\r
+The idea is to provide a more or less drop in replacement for readline\r
+to read from zlib/gzip streams. Take the opportunity to replace\r
+malloc with talloc.\r
+---\r
+ util/Makefile.local | 2 +-\r
+ util/util.h | 12 +++++++++\r
+ util/zlib-extra.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++\r
+ util/zlib-extra.h | 11 ++++++++\r
+ 4 files changed, 100 insertions(+), 1 deletion(-)\r
+ create mode 100644 util/util.h\r
+ create mode 100644 util/zlib-extra.c\r
+ create mode 100644 util/zlib-extra.h\r
+\r
+diff --git a/util/Makefile.local b/util/Makefile.local\r
+index 29c0ce6..e2a5b65 100644\r
+--- a/util/Makefile.local\r
++++ b/util/Makefile.local\r
+@@ -4,7 +4,7 @@ dir := util\r
+ extra_cflags += -I$(srcdir)/$(dir)\r
+ \r
+ libutil_c_srcs := $(dir)/xutil.c $(dir)/error_util.c $(dir)/hex-escape.c \\r
+- $(dir)/string-util.c $(dir)/talloc-extra.c\r
++ $(dir)/string-util.c $(dir)/talloc-extra.c $(dir)/zlib-extra.c\r
+ \r
+ libutil_modules := $(libutil_c_srcs:.c=.o)\r
+ \r
+diff --git a/util/util.h b/util/util.h\r
+new file mode 100644\r
+index 0000000..8663cfc\r
+--- /dev/null\r
++++ b/util/util.h\r
+@@ -0,0 +1,12 @@\r
++#ifndef _UTIL_H\r
++#define _UTIL_H\r
++\r
++typedef enum util_status {\r
++ UTIL_SUCCESS = 0,\r
++ UTIL_ERROR = 1,\r
++ UTIL_OUT_OF_MEMORY,\r
++ UTIL_EOF,\r
++ UTIL_FILE,\r
++} util_status_t;\r
++\r
++#endif\r
+diff --git a/util/zlib-extra.c b/util/zlib-extra.c\r
+new file mode 100644\r
+index 0000000..cb1eba0\r
+--- /dev/null\r
++++ b/util/zlib-extra.c\r
+@@ -0,0 +1,76 @@\r
++/* zlib-extra.c - Extra or enhanced routines for compressed I/O.\r
++ *\r
++ * Copyright (c) 2014 David Bremner\r
++ *\r
++ * This program is free software: you can redistribute it and/or modify\r
++ * it under the terms of the GNU General Public License as published by\r
++ * the Free Software Foundation, either version 3 of the License, or\r
++ * (at your option) any later version.\r
++ *\r
++ * This program is distributed in the hope that it will be useful,\r
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
++ * GNU General Public License for more details.\r
++ *\r
++ * You should have received a copy of the GNU General Public License\r
++ * along with this program. If not, see http://www.gnu.org/licenses/ .\r
++ *\r
++ * Author: David Bremner <david@tethera.net>\r
++ */\r
++\r
++#include "zlib-extra.h"\r
++#include <talloc.h>\r
++#include <stdio.h>\r
++#include <string.h>\r
++\r
++/* mimic POSIX/glibc getline, but on a zlib gzFile stream, and using talloc */\r
++util_status_t\r
++gz_getline (void *talloc_ctx, char **bufptr, size_t *bufsiz, ssize_t *bytes_read,\r
++ gzFile stream)\r
++{\r
++ size_t len = *bufsiz;\r
++ char *buf = *bufptr;\r
++ size_t offset = 0;\r
++\r
++ if (len == 0 || buf == NULL) {\r
++ /* same as getdelim from gnulib */\r
++ len = 120;\r
++ buf = talloc_size (talloc_ctx, len);\r
++ if (buf == NULL)\r
++ return UTIL_OUT_OF_MEMORY;\r
++ }\r
++\r
++ while (1) {\r
++ if (! gzgets (stream, buf + offset, len - offset)) {\r
++ int zlib_status = 0;\r
++ (void) gzerror (stream, &zlib_status);\r
++ switch (zlib_status) {\r
++ case Z_OK:\r
++ /* follow getline behaviour */\r
++ *bytes_read = -1;\r
++ return UTIL_EOF;\r
++ break;\r
++ case Z_ERRNO:\r
++ return UTIL_FILE;\r
++ break;\r
++ default:\r
++ return UTIL_ERROR;\r
++ }\r
++ }\r
++\r
++ offset += strlen (buf + offset);\r
++\r
++ if ( buf[offset - 1] == '\n' )\r
++ break;\r
++\r
++ len *= 2;\r
++ buf = talloc_realloc (talloc_ctx, buf, char, len);\r
++ if (buf == NULL)\r
++ return UTIL_OUT_OF_MEMORY;\r
++ }\r
++\r
++ *bufptr = buf;\r
++ *bufsiz = len;\r
++ *bytes_read = offset;\r
++ return UTIL_SUCCESS;\r
++}\r
+diff --git a/util/zlib-extra.h b/util/zlib-extra.h\r
+new file mode 100644\r
+index 0000000..ed46ac1\r
+--- /dev/null\r
++++ b/util/zlib-extra.h\r
+@@ -0,0 +1,11 @@\r
++#ifndef _ZLIB_EXTRA_H\r
++#define _ZLIB_EXTRA_H\r
++\r
++#include <zlib.h>\r
++#include "util.h"\r
++/* Like getline, but read from a gzFile. Allocation is with talloc */\r
++util_status_t\r
++gz_getline (void *ctx, char **lineptr, size_t *line_size, ssize_t *bytes_read,\r
++ gzFile stream);\r
++\r
++#endif\r
+-- \r
+1.9.0\r
+\r
projects / notmuch-archives.git / commitdiff