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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: [Patch v7 2/6] util: add gz_readline\r
+Date: Sat, 5 Apr 2014 12:43:52 -0300\r
+Message-Id: <1396712636-10640-3-git-send-email-david@tethera.net>\r
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+References: <1396712636-10640-1-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 | 3 +-\r
+ util/util.c | 24 +++++++++++++++\r
+ util/util.h | 29 ++++++++++++++++++\r
+ util/zlib-extra.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++\r
+ util/zlib-extra.h | 25 ++++++++++++++++\r
+ 5 files changed, 165 insertions(+), 1 deletion(-)\r
+ create mode 100644 util/util.c\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..905f237 100644\r
+--- a/util/Makefile.local\r
++++ b/util/Makefile.local\r
+@@ -4,7 +4,8 @@ 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
++ $(dir)/util.c\r
+ \r
+ libutil_modules := $(libutil_c_srcs:.c=.o)\r
+ \r
+diff --git a/util/util.c b/util/util.c\r
+new file mode 100644\r
+index 0000000..3bd305d\r
+--- /dev/null\r
++++ b/util/util.c\r
+@@ -0,0 +1,24 @@\r
++#include "util.h"\r
++#include "error_util.h"\r
++#include <string.h>\r
++#include <errno.h>\r
++\r
++const char *\r
++util_error_string (util_status_t errnum)\r
++{\r
++ switch (errnum) {\r
++ case UTIL_SUCCESS:\r
++ return "none";\r
++ case UTIL_OUT_OF_MEMORY:\r
++ return "out of memory";\r
++ case UTIL_EOF:\r
++ return "end of file";\r
++ case UTIL_ERRNO:\r
++ return strerror (errno);\r
++ case UTIL_GZERROR:\r
++ /* we lack context to be more informative here */\r
++ return "zlib error";\r
++ default:\r
++ INTERNAL_ERROR("unexpected error status %d", errnum);\r
++ }\r
++}\r
+diff --git a/util/util.h b/util/util.h\r
+new file mode 100644\r
+index 0000000..d12fadb\r
+--- /dev/null\r
++++ b/util/util.h\r
+@@ -0,0 +1,29 @@\r
++#ifndef _UTIL_H\r
++#define _UTIL_H\r
++\r
++typedef enum util_status {\r
++ /**\r
++ * No error occurred.\r
++ */\r
++ UTIL_SUCCESS = 0,\r
++ /**\r
++ * Out of memory.\r
++ */\r
++ UTIL_OUT_OF_MEMORY,\r
++ /**\r
++ * End of stream reached while attempting to read.\r
++ */\r
++ UTIL_EOF,\r
++ /**\r
++ * Low level error occured, consult errno.\r
++ */\r
++ UTIL_ERRNO,\r
++ /**\r
++ * Zlib error occured, call gzerror for details.\r
++ */\r
++ UTIL_GZERROR\r
++} util_status_t;\r
++\r
++const char *\r
++util_error_string (util_status_t status);\r
++#endif\r
+diff --git a/util/zlib-extra.c b/util/zlib-extra.c\r
+new file mode 100644\r
+index 0000000..cb34845\r
+--- /dev/null\r
++++ b/util/zlib-extra.c\r
+@@ -0,0 +1,85 @@\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, ssize_t *bytes_read, gzFile stream)\r
++{\r
++ char *buf = *bufptr;\r
++ unsigned int len;\r
++ size_t offset = 0;\r
++\r
++ if (buf) {\r
++ len = talloc_array_length (buf);\r
++ } else {\r
++ /* same as getdelim from gnulib */\r
++ len = 120;\r
++ buf = talloc_array (talloc_ctx, char, 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
++ /* Null indicates EOF or error */\r
++ int zlib_status = 0;\r
++ (void) gzerror (stream, &zlib_status);\r
++ switch (zlib_status) {\r
++ case Z_OK:\r
++ /* no data read before EOF */\r
++ if (offset == 0)\r
++ return UTIL_EOF;\r
++ else\r
++ goto SUCCESS;\r
++ case Z_ERRNO:\r
++ return UTIL_ERRNO;\r
++ default:\r
++ return UTIL_GZERROR;\r
++ }\r
++ }\r
++\r
++ offset += strlen (buf + offset);\r
++\r
++ if (buf[offset - 1] == '\n')\r
++ goto SUCCESS;\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
++ SUCCESS:\r
++ *bufptr = buf;\r
++ *bytes_read = offset;\r
++ return UTIL_SUCCESS;\r
++}\r
++\r
++const char *gz_error_string (util_status_t status, gzFile file) \r
++{\r
++ if (status == UTIL_GZERROR)\r
++ return gzerror (file, NULL);\r
++ else\r
++ return util_error_string (status);\r
++}\r
+diff --git a/util/zlib-extra.h b/util/zlib-extra.h\r
+new file mode 100644\r
+index 0000000..dbaa0b9\r
+--- /dev/null\r
++++ b/util/zlib-extra.h\r
+@@ -0,0 +1,25 @@\r
++#ifndef _ZLIB_EXTRA_H\r
++#define _ZLIB_EXTRA_H\r
++\r
++#include "util.h"\r
++#include <zlib.h>\r
++\r
++/* Like getline, but read from a gzFile. Allocation is with talloc.\r
++ * Returns:\r
++ *\r
++ * UTIL_SUCCESS, UTIL_OUT_OF_MEMORY, UTIL_ERRNO, UTIL_GZERROR\r
++ * Consult util.h for description\r
++ *\r
++ * UTIL_EOF End of file encountered before \r
++ * any characters read\r
++ */\r
++util_status_t\r
++gz_getline (void *ctx, char **lineptr, ssize_t *bytes_read, gzFile stream);\r
++\r
++/* return a suitable error string based on the return status\r
++ * from gz_readline\r
++ */\r
++\r
++const char *\r
++gz_error_string (util_status_t status, gzFile stream);\r
++#endif\r
+-- \r
+1.9.0\r
+\r
projects / notmuch-archives.git / blobdiff