logger: fix const qualifier warnings for C23

Fix const qualifier discarded warnings in valid_structured_data_param()
and valid_structured_data_id() functions. These warnings are reported by
gcc 15 which defaults to the C23 standard.

The strchr() and strstr() functions return pointers into const strings,
so the receiving variables must be declared as const char *.

Signed-off-by: Karel Zak <kzak@redhat.com>
(cherry picked from commit 22c3b959ef381b35a55ed00cf6acd2507b461d4b)

diff --git a/misc-utils/logger.c b/misc-utils/logger.c
index f332a7d2716d0249313d307a0cf53c2812310538..2a45b12bf264f2ec8c5ed870d31a5d868e23f25f 100644 (file)
--- a/misc-utils/logger.c
+++ b/misc-utils/logger.c
@@ -699,10 +699,10 @@ static char *get_structured_data_string(struct logger_ctl *ctl)
 
 static int valid_structured_data_param(const char *str)
 {
-       char *s;
-       char *eq  = strchr(str, '='),
-            *qm1 = strchr(str, '"'),
-            *qm2 = qm1 ? ul_strchr_escaped(qm1 + 1, '"') : NULL;
+       const char *s;
+       const char *eq  = strchr(str, '='),
+                  *qm1 = strchr(str, '"'),
+                  *qm2 = qm1 ? ul_strchr_escaped(qm1 + 1, '"') : NULL;
 
        /* something is missing */
        if (!eq || !qm1 || !qm2)
@@ -710,7 +710,7 @@ static int valid_structured_data_param(const char *str)
 
        /* ']' need to be escaped */
        for (s = qm1 + 1; s && *s; ) {
-               char *p = strchr(s, ']');
+               const char *p = strchr(s, ']');
                if (!p)
                        break;
                if (p > qm2 || p == ul_strchr_escaped(s, ']'))
@@ -720,7 +720,7 @@ static int valid_structured_data_param(const char *str)
 
        /* '\' is allowed only before '[]"\' chars */
        for (s = qm1 + 1; s && *s; ) {
-               char *p = strchr(s, '\\');
+               const char *p = strchr(s, '\\');
                if (!p)
                        break;
                if (!strchr("[]\"\\", *(p + 1)))
@@ -739,7 +739,7 @@ static int valid_structured_data_param(const char *str)
  */
 static int valid_structured_data_id(const char *str)
 {
-       char *at = strchr(str, '@');
+       const char *at = strchr(str, '@');
        const char *p;
 
        /* standardized IDs without @<digits> */