85 lines
2.2 KiB
Diff
85 lines
2.2 KiB
Diff
From 2e5a8775941b5767abcfcf93f9f84c9560e0f378 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Thu, 12 Mar 2020 13:59:05 +0000
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Subject: [PATCH] daemon: Add filter_list utility function.
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For filtering lists of strings based on a predicate.
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(cherry picked from commit af8ed266a282bb20882a9ffb611bd64243d19218)
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---
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daemon/daemon.h | 2 ++
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daemon/utils.c | 30 ++++++++++++++++++++++++++++++
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2 files changed, 32 insertions(+)
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diff --git a/daemon/daemon.h b/daemon/daemon.h
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index 66bfdc49e..115591728 100644
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--- a/daemon/daemon.h
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+++ b/daemon/daemon.h
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@@ -22,6 +22,7 @@
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdint.h>
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+#include <stdbool.h>
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#include <errno.h>
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#include <unistd.h>
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@@ -74,6 +75,7 @@ extern void free_stringsbuf (struct stringsbuf *sb);
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extern struct stringsbuf split_lines_sb (char *str);
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extern char **split_lines (char *str);
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extern char **empty_list (void);
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+extern char **filter_list (bool (*p) (const char *), char **strs);
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extern int is_power_of_2 (unsigned long v);
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extern void trim (char *str);
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extern int parse_btrfsvol (const char *desc, mountable_t *mountable);
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diff --git a/daemon/utils.c b/daemon/utils.c
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index c3f88bcab..e87233d0f 100644
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--- a/daemon/utils.c
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+++ b/daemon/utils.c
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@@ -24,6 +24,7 @@
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#include <stdio.h>
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#include <stdlib.h>
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+#include <stdbool.h>
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#include <string.h>
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#include <unistd.h>
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#include <rpc/types.h>
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@@ -482,6 +483,35 @@ empty_list (void)
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return ret.argv;
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}
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+/**
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+ * Filter a list of strings. Returns a newly allocated list of only
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+ * the strings where C<p (str) == true>.
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+ *
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+ * B<Note> it does not copy the strings, be careful not to double-free
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+ * them.
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+ */
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+char **
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+filter_list (bool (*p) (const char *str), char **strs)
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+{
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+ DECLARE_STRINGSBUF (ret);
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+ size_t i;
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+
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+ for (i = 0; strs[i] != NULL; ++i) {
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+ if (p (strs[i])) {
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+ if (add_string_nodup (&ret, strs[i]) == -1) {
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+ free (ret.argv);
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+ return NULL;
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+ }
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+ }
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+ }
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+ if (end_stringsbuf (&ret) == -1) {
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+ free (ret.argv);
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+ return NULL;
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+ }
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+
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+ return take_stringsbuf (&ret);
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+}
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+
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/**
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* Skip leading and trailing whitespace, updating the original string
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* in-place.
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--
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2.18.4
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