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-rw-r--r--src/util/logwriter.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/src/util/logwriter.c b/src/util/logwriter.c
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+/*++
+/* NAME
+/* logwriter 3
+/* SUMMARY
+/* logfile writer
+/* SYNOPSIS
+/* #include <logwriter.h>
+/*
+/* VSTREAM *logwriter_open_or_die(
+/* const char *path)
+/*
+/* int logwriter_write(
+/* VSTREAM *file,
+/* const char *buffer.
+/* ssize_t buflen)
+/*
+/* int logwriter_close(
+/* VSTREAM *file)
+/*
+/* int logwriter_one_shot(
+/* const char *path,
+/* const char *buffer,
+/* ssize_t buflen)
+/* DESCRIPTION
+/* This module manages a logfile writer.
+/*
+/* logwriter_open_or_die() safely opens the specified file in
+/* write+append mode. File open/create errors are fatal.
+/*
+/* logwriter_write() writes the buffer plus newline to the
+/* open logfile. The result is zero if successful, VSTREAM_EOF
+/* if the operation failed.
+/*
+/* logwriter_close() closes the logfile and destroys the VSTREAM
+/* instance. The result is zero if there were no errors writing
+/* the file, VSTREAM_EOF otherwise.
+/*
+/* logwriter_one_shot() combines all the above operations. The
+/* result is zero if successful, VSTREAM_EOF if any operation
+/* failed.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+ /*
+ * System library.
+ */
+#include <sys_defs.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+ /*
+ * Utility library.
+ */
+#include <iostuff.h>
+#include <logwriter.h>
+#include <msg.h>
+#include <mymalloc.h>
+#include <safe_open.h>
+#include <vstream.h>
+
+ /*
+ * Application-specific.
+ */
+
+/* logwriter_open_or_die - open logfile */
+
+VSTREAM *logwriter_open_or_die(const char *path)
+{
+ VSTREAM *fp;
+ VSTRING *why = vstring_alloc(100);
+
+#define NO_STATP ((struct stat *) 0)
+#define NO_CHOWN (-1)
+#define NO_CHGRP (-1)
+
+ fp = safe_open(path, O_CREAT | O_WRONLY | O_APPEND, 0644,
+ NO_STATP, NO_CHOWN, NO_CHGRP, why);
+ if (fp == 0)
+ msg_fatal("open logfile '%s': %s", path, vstring_str(why));
+ close_on_exec(vstream_fileno(fp), CLOSE_ON_EXEC);
+ vstring_free(why);
+ return (fp);
+}
+
+/* logwriter_write - append to logfile */
+
+int logwriter_write(VSTREAM *fp, const char *buf, ssize_t len)
+{
+ if (len < 0)
+ msg_panic("logwriter_write: negative length %ld", (long) len);
+ if (vstream_fwrite(fp, buf, len) != len)
+ return (VSTREAM_EOF);
+ VSTREAM_PUTC('\n', fp);
+ return (vstream_fflush(fp));
+}
+
+/* logwriter_close - close logfile */
+
+int logwriter_close(VSTREAM *fp)
+{
+ return (vstream_fclose(fp));
+}
+
+/* logwriter_one_shot - one-shot logwriter */
+
+int logwriter_one_shot(const char *path, const char *buf, ssize_t len)
+{
+ VSTREAM *fp;
+ int err;
+
+ fp = logwriter_open_or_die(path);
+ err = logwriter_write(fp, buf, len);
+ err |= logwriter_close(fp);
+ return (err ? VSTREAM_EOF : 0);
+}