From b668e52c906b664b353d5a99cfa3ff36f73b341d Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Sun, 15 Feb 2026 14:41:20 +0100
Subject: [PATCH] *: placate warnings where strchr/strstr returns constant
 pointer

Newer glibc is now smarter and can propagate const-ness from those!

function                                             old     new   delta
readtoken1                                          3111    3108      -3

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 coreutils/od_bloaty.c           |  7 ++++---
 coreutils/printf.c              |  2 +-
 editors/awk.c                   |  2 +-
 klibc-utils/resume.c            |  2 +-
 libbb/get_last_path_component.c |  4 ++--
 libbb/replace.c                 |  3 ++-
 libbb/strrstr.c                 |  4 ++--
 libbb/xfuncs_printf.c           |  2 +-
 libpwdgrp/uidgid_get.c          |  3 ++-
 miscutils/bc.c                  |  2 +-
 networking/httpd.c              |  2 +-
 networking/ifconfig.c           |  2 +-
 networking/ifupdown.c           |  2 +-
 networking/nbd-client.c         |  2 +-
 networking/route.c              | 34 ++++++++++++++++-----------------
 networking/udhcp/d6_socket.c    |  3 ++-
 networking/udhcp/socket.c       |  3 ++-
 printutils/lpr.c                |  2 +-
 procps/nmeter.c                 |  5 +++--
 procps/powertop.c               |  5 +++--
 scripts/kconfig/confdata.c      |  2 +-
 shell/ash.c                     | 14 +++++++-------
 22 files changed, 57 insertions(+), 50 deletions(-)

diff --git a/coreutils/od_bloaty.c b/coreutils/od_bloaty.c
index e886a4ed2..c0e6681f2 100644
--- a/coreutils/od_bloaty.c
+++ b/coreutils/od_bloaty.c
@@ -1155,7 +1155,7 @@ dump_strings(off_t address, off_t end_offset)
    leading '+' return nonzero and set *OFFSET to the offset it denotes.  */
 
 static int
-parse_old_offset(const char *s, off_t *offset)
+parse_old_offset(char *s, off_t *offset)
 {
 	static const struct suffix_mult Bb[] ALIGN_SUFFIX = {
 		{ "B", 1024 },
@@ -1181,7 +1181,8 @@ parse_old_offset(const char *s, off_t *offset)
 		radix = 16;
 
 	*offset = xstrtooff_sfx(s, radix, Bb);
-	if (p) p[0] = '.';
+	if (p)
+		p[0] = '.'; /* undo cheating */
 
 	return (*offset >= 0);
 }
@@ -1234,7 +1235,7 @@ int od_main(int argc UNUSED_PARAM, char **argv)
 		static const uint8_t doxn_address_pad_len_char[] ALIGN1 = {
 			'7', '7', '6', /* '?' */
 		};
-		char *p;
+		const char *p;
 		int pos;
 		p = strchr(doxn, str_A[0]);
 		if (!p)
diff --git a/coreutils/printf.c b/coreutils/printf.c
index 4edcfa9b5..3cd48cfcc 100644
--- a/coreutils/printf.c
+++ b/coreutils/printf.c
@@ -354,7 +354,7 @@ static char **print_formatted(char *f, char **argv, int *conv_err)
 			/* Add "ll" if integer modifier, then print */
 			{
 				static const char format_chars[] ALIGN1 = "diouxXfeEgGcs";
-				char *p = strchr(format_chars, *f);
+				char *p = (char*)strchr(format_chars, *f);
 				/* needed - try "printf %" without it */
 				if (p == NULL || *f == '\0') {
 					bb_error_msg("%s: invalid format", direc_start);
diff --git a/editors/awk.c b/editors/awk.c
index beba487fb..dd8f4ac42 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -2841,7 +2841,7 @@ static NOINLINE var *exec_builtin(node *op, var *res)
 		l = strlen(as[0]) - ll;
 		if (ll > 0 && l >= 0) {
 			if (!icase) {
-				char *s = strstr(as[0], as[1]);
+				const char *s = strstr(as[0], as[1]);
 				if (s)
 					n = (s - as[0]) + 1;
 			} else {
diff --git a/klibc-utils/resume.c b/klibc-utils/resume.c
index 179413627..cb8314c75 100644
--- a/klibc-utils/resume.c
+++ b/klibc-utils/resume.c
@@ -31,7 +31,7 @@
  * - /dev/ram (alias to /dev/ram0)
  * - /dev/mtd
  */
-static dev_t name_to_dev_t(const char *devname)
+static dev_t name_to_dev_t(char *devname)
 {
 	char devfile[sizeof(int)*3 * 2 + 4];
 	char *sysname;
diff --git a/libbb/get_last_path_component.c b/libbb/get_last_path_component.c
index 04fdf2a3e..f9d56ad23 100644
--- a/libbb/get_last_path_component.c
+++ b/libbb/get_last_path_component.c
@@ -24,12 +24,12 @@ const char* FAST_FUNC bb_basename(const char *name)
  */
 char* FAST_FUNC bb_get_last_path_component_nostrip(const char *path)
 {
-	char *slash = strrchr(path, '/');
+	const char *slash = strrchr(path, '/');
 
 	if (!slash || (slash == path && !slash[1]))
 		return (char*)path;
 
-	return slash + 1;
+	return (char*)slash + 1;
 }
 
 /*
diff --git a/libbb/replace.c b/libbb/replace.c
index bc26b04cc..273330f8a 100644
--- a/libbb/replace.c
+++ b/libbb/replace.c
@@ -28,7 +28,8 @@ unsigned FAST_FUNC count_strstr(const char *str, const char *sub)
 
 char* FAST_FUNC xmalloc_substitute_string(const char *src, int count, const char *sub, const char *repl)
 {
-	char *buf, *dst, *end;
+	char *buf, *dst;
+	const char *end;
 	size_t sub_len = strlen(sub);
 	size_t repl_len = strlen(repl);
 
diff --git a/libbb/strrstr.c b/libbb/strrstr.c
index a173b034f..bea5d1773 100644
--- a/libbb/strrstr.c
+++ b/libbb/strrstr.c
@@ -19,10 +19,10 @@ char* FAST_FUNC strrstr(const char *haystack, const char *needle)
 	if (!needle[0])
 		return (char*)haystack + strlen(haystack);
 	while (1) {
-		char *p = strstr(haystack, needle);
+		const char *p = strstr(haystack, needle);
 		if (!p)
 			return r;
-		r = p;
+		r = (char *)p;
 		haystack = p + 1;
 	}
 }
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index ed10084b3..8afa1ef68 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -379,7 +379,7 @@ void FAST_FUNC bb_unsetenv(const char *var)
 	char onstack[128 - 16]; /* smaller stack setup code on x86 */
 	char *tp;
 
-	tp = strchr(var, '=');
+	tp = (char*)strchr(var, '=');
 	if (tp) {
 		/* In case var was putenv'ed, we can't replace '='
 		 * with NUL and unsetenv(var) - it won't work,
diff --git a/libpwdgrp/uidgid_get.c b/libpwdgrp/uidgid_get.c
index d76eb8298..2aa444416 100644
--- a/libpwdgrp/uidgid_get.c
+++ b/libpwdgrp/uidgid_get.c
@@ -32,7 +32,8 @@ int FAST_FUNC get_uidgid(struct bb_uidgid_t *u, const char *ug)
 {
 	struct passwd *pwd;
 	struct group *gr;
-	char *user, *group;
+	char *user;
+	const char *group;
 	unsigned n;
 
 	user = (char*)ug;
diff --git a/miscutils/bc.c b/miscutils/bc.c
index 28bc40c8b..1ef8f418d 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -5525,7 +5525,7 @@ static void xc_program_printString(const char *str)
 		char c = *str++;
 		if (c == '\\') {
 			static const char esc[] ALIGN1 = "nabfrt""e\\";
-			char *n;
+			const char *n;
 
 			c = *str++;
 			n = strchr(esc, c); // note: if c is NUL, n = \0 at end of esc
diff --git a/networking/httpd.c b/networking/httpd.c
index 3739fd55f..3b811cb71 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -1846,7 +1846,7 @@ static void send_cgi_and_exit(
  */
 static NOINLINE void send_file_and_exit(const char *url, int what)
 {
-	char *suffix;
+	const char *suffix;
 	int fd;
 	ssize_t count;
 
diff --git a/networking/ifconfig.c b/networking/ifconfig.c
index 9ee232a66..32638e2a3 100644
--- a/networking/ifconfig.c
+++ b/networking/ifconfig.c
@@ -336,7 +336,7 @@ int ifconfig_main(int argc UNUSED_PARAM, char **argv)
 #endif
 	char *p;
 	/*char host[128];*/
-	const char *host = NULL; /* make gcc happy */
+	char *host = NULL; /* make gcc happy */
 	IF_FEATURE_IFCONFIG_STATUS(char *show_all_param;)
 
 	did_flags = 0;
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index bc2dca506..6832ee0d4 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -363,7 +363,7 @@ static char *parse(const char *command, struct interface_defn_t *ifd)
 			break;
 		case '%':
 			{
-				char *nextpercent;
+				const char *nextpercent;
 				char *varvalue;
 
 				command++;
diff --git a/networking/nbd-client.c b/networking/nbd-client.c
index 556fa8c97..4fda66125 100644
--- a/networking/nbd-client.c
+++ b/networking/nbd-client.c
@@ -260,7 +260,7 @@ int nbdclient_main(int argc, char **argv)
 		// needs some other process to sit in ioctl(nbd, NBD_DO_IT).
 		if (fork() == 0) {
 			/* child */
-			char *s = strrchr(device, '/');
+			const char *s = strrchr(device, '/');
 			sprintf(data, "/sys/block/%.32s/pid", s ? s + 1 : device);
 			// Is it up yet?
 			for (;;) {
diff --git a/networking/route.c b/networking/route.c
index 6e2d30cfd..9d9b72416 100644
--- a/networking/route.c
+++ b/networking/route.c
@@ -179,7 +179,7 @@ static NOINLINE void INET_setroute(int action, char **args)
 	memset(rt, 0, sizeof(*rt));
 
 	{
-		const char *target = *args++;
+		char *target = *args++;
 		char *prefix;
 
 		/* recognize x.x.x.x/mask format. */
@@ -353,25 +353,25 @@ static NOINLINE void INET6_setroute(int action, char **args)
 	int prefix_len, skfd;
 	const char *devname;
 
-		/* We know args isn't NULL from the check in route_main. */
-		const char *target = *args++;
+	/* We know args isn't NULL from the check in route_main. */
+	char *target = *args++;
 
-		if (strcmp(target, "default") == 0) {
-			prefix_len = 0;
-			memset(&sa6, 0, sizeof(sa6));
+	if (strcmp(target, "default") == 0) {
+		prefix_len = 0;
+		memset(&sa6, 0, sizeof(sa6));
+	} else {
+		char *cp;
+		cp = strchr(target, '/'); /* Yes... const to non is ok. */
+		if (cp) {
+			*cp = '\0';
+			prefix_len = xatoul_range(cp + 1, 0, 128);
 		} else {
-			char *cp;
-			cp = strchr(target, '/'); /* Yes... const to non is ok. */
-			if (cp) {
-				*cp = '\0';
-				prefix_len = xatoul_range(cp + 1, 0, 128);
-			} else {
-				prefix_len = 128;
-			}
-			if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
-				bb_error_msg_and_die("resolving %s", target);
-			}
+			prefix_len = 128;
 		}
+		if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
+			bb_error_msg_and_die("resolving %s", target);
+		}
+	}
 
 	/* Clean out the RTREQ structure. */
 	memset(&rt, 0, sizeof(rt));
diff --git a/networking/udhcp/d6_socket.c b/networking/udhcp/d6_socket.c
index acf108367..83df4b396 100644
--- a/networking/udhcp/d6_socket.c
+++ b/networking/udhcp/d6_socket.c
@@ -116,7 +116,8 @@ int FAST_FUNC d6_listen_socket(int port, const char *inf)
 		bb_simple_perror_msg_and_die("SO_BROADCAST");
 
 	/* SO_BINDTODEVICE doesn't work on ethernet aliases (ethN:M) */
-	colon = strrchr(inf, ':');
+	colon = (char*)strrchr(inf, ':');
+	/* NB: inf can really be a *const* string if it's a default, but defaults have no ':' */
 	if (colon)
 		*colon = '\0';
 
diff --git a/networking/udhcp/socket.c b/networking/udhcp/socket.c
index 35e10688b..5d2283eaf 100644
--- a/networking/udhcp/socket.c
+++ b/networking/udhcp/socket.c
@@ -90,7 +90,8 @@ int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
 		bb_simple_perror_msg_and_die("SO_BROADCAST");
 
 	/* SO_BINDTODEVICE doesn't work on ethernet aliases (ethN:M) */
-	colon = strrchr(inf, ':');
+	colon = (char*)strrchr(inf, ':');
+	/* NB: inf can really be a *const* string if it's a default, but defaults have no ':' */
 	if (colon)
 		*colon = '\0';
 
diff --git a/printutils/lpr.c b/printutils/lpr.c
index 25b0f7235..464208c65 100644
--- a/printutils/lpr.c
+++ b/printutils/lpr.c
@@ -122,7 +122,7 @@ int lpqr_main(int argc UNUSED_PARAM, char **argv)
 
 	{
 		// queue name is to the left of '@'
-		char *s = strchr(queue, '@');
+		char *s = (char *)strchr(queue, '@');
 		if (s) {
 			// server name is to the right of '@'
 			*s = '\0';
diff --git a/procps/nmeter.c b/procps/nmeter.c
index dca07eac6..fd8907aac 100644
--- a/procps/nmeter.c
+++ b/procps/nmeter.c
@@ -913,7 +913,8 @@ int nmeter_main(int argc UNUSED_PARAM, char **argv)
 	// parameters as seen by e.g. ps. Making a copy...
 	cur = xstrdup(argv[0]);
 	while (1) {
-		char *param, *p;
+		char *param;
+		const char *p;
 		prev = cur;
  again:
 		cur = strchr(cur, '%');
@@ -929,7 +930,7 @@ int nmeter_main(int argc UNUSED_PARAM, char **argv)
 			// format: %[foptstring]
 			cur++;
 			p = strchr(options, cur[0]);
-			param = cur+1;
+			param = cur + 1;
 			while (cur[0] != ']') {
 				if (!cur[0])
 					bb_show_usage();
diff --git a/procps/powertop.c b/procps/powertop.c
index 6fe892540..a24748efc 100644
--- a/procps/powertop.c
+++ b/procps/powertop.c
@@ -238,7 +238,7 @@ static void save_line(const char *string, int count)
 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 static int is_hpet_irq(const char *name)
 {
-	char *p;
+	const char *p;
 # if BLOATY_HPET_IRQ_NUM_DETECTION
 	long hpet_chan;
 
@@ -423,7 +423,8 @@ static NOINLINE int process_timer_stats(void)
 //     1,  2159 udisks-daemon    hrtimer_start_range_ns (hrtimer_wakeup)
 // 331 total events, 249.059 events/sec
 		while (fgets(buf, sizeof(buf), fp)) {
-			const char *count, *process, *func;
+			const char *process, *func;
+			char *count;
 			char *p;
 			int idx;
 			unsigned cnt;
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 249a3195e..d13a7d66b 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -348,7 +348,7 @@ int conf_write(const char *name)
 	dirname[0] = 0;
 	if (name && name[0]) {
 		struct stat st;
-		char *slash;
+		const char *slash;
 
 		if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 			strcpy(dirname, name);
diff --git a/shell/ash.c b/shell/ash.c
index 4f824e1b2..19623a9a0 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -8725,7 +8725,7 @@ test_exec(/*const char *fullname,*/ struct stat *statb)
 }
 
 /* Circular dep: find_command->find_builtin->builtintab[]->hashcmd->find_command */
-static struct builtincmd *find_builtin(const char *name);
+static const struct builtincmd *find_builtin(const char *name);
 #if ENABLE_ASH_BASH_NOT_FOUND_HOOK
 static int evalfun(struct funcnode *func, int argc, char **argv, int flags);
 #endif
@@ -8746,7 +8746,7 @@ find_command(char *name, struct cmdentry *entry, int act, const char *path)
 	struct stat statb;
 	int e;
 	int updatetbl;
-	struct builtincmd *bcmd;
+	const struct builtincmd *bcmd;
 	int len;
 
 	/* If name contains a slash, don't use PATH or hash table */
@@ -10836,10 +10836,10 @@ static const struct builtincmd builtintab[] = {
 /*
  * Search the table of builtin commands.
  */
-static struct builtincmd *
+static const struct builtincmd *
 find_builtin(const char *name)
 {
-	struct builtincmd *bp;
+	const struct builtincmd *bp;
 
 	bp = bsearch(
 		name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
@@ -12927,12 +12927,12 @@ decode_dollar_squote(void)
 {
 	static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
 	int c, cnt;
-	char *p;
 	char buf[4];
 
 	c = pgetc();
-	p = strchr(C_escapes, c);
-	if (p) {
+	if (strchr(C_escapes, c)) {
+		char *p;
+
 		buf[0] = c;
 		p = buf;
 		cnt = 3;