diff --git a/include/ucore/dstr.h b/include/ucore/dstr.h
index 083de2f..e71c397 100644
--- a/include/ucore/dstr.h
+++ b/include/ucore/dstr.h
@@ -47,7 +47,7 @@ void uc_dstr_destroy(struct DStr *str);
  *
  * @return 0 if success, != 0 if allocation fails
  */
-int uc_dstr_copy(struct DStr *dest, const struct DStr *src);
+int uc_dstr_copy(struct DStr *restrict dest, const struct DStr *restrict src);
 
 /**
  * @return the available/unused tail bytes in the string.
@@ -95,7 +95,7 @@ char *uc_dstr_put(struct DStr *str, size_t len);
  * @param is_x ctype.h compatible function to use as a filter.
  * @return number of chars appended
  */
-size_t uc_dstr_put_str_filter(struct DStr *str, const char *s, int (*is_x)(int c));
+size_t uc_dstr_put_str_filter(struct DStr *str, const char *restrict s, int (*is_x)(int c));
 
 /* Append a string of the give size.
  * (The nul terminator is not appended) 
@@ -104,14 +104,14 @@ size_t uc_dstr_put_str_filter(struct DStr *str, const char *s, int (*is_x)(int c
  * @param len bytes to append (not including the nul terminator) 
  * @return 0 on success (!= 0 if an allocation fail)
  */
-int uc_dstr_put_str_sz(struct DStr *str, const char *s, size_t len);
+int uc_dstr_put_str_sz(struct DStr *str, const char *restrict s, size_t len);
 
 /* Append a string.
  * (The nul terminator is not appended) 
  *
  *  @return 0 on success (!= 0 if an allocation fail)
  */
-int uc_dstr_put_str(struct DStr *str, const char *s);
+int uc_dstr_put_str(struct DStr *str, const char *restrict s);
 
 /* Append a single char.
  *
@@ -122,7 +122,7 @@ int uc_dstr_put_char(struct DStr *str, char c);
 /* Make the DStr take ownership of the given dynamically allocated string.
  * Any existing string in the DStr is freed.
  */
-void uc_dstr_own(struct DStr *str, char *s);
+void uc_dstr_own(struct DStr *str, char *restrict s);
 
 /** Release the managed string.
  * The caller is now responsible for managing/free'ing the returned string.
@@ -133,7 +133,7 @@ void uc_dstr_own(struct DStr *str, char *s);
 char *uc_dstr_steal(struct DStr *str);
 
 /** Swap the A and B DStr */
-void uc_str_swap(struct DStr *a, struct DStr *b);
+void uc_str_swap(struct DStr *restrict a, struct DStr *restrict b);
 
 /** Replace all occurences in the DStr
  * (This may be used to replace any embedded nul bytes too)
@@ -149,10 +149,10 @@ size_t uc_dstr_replace(struct DStr *str, char f, char r);
 void uc_dstr_trim(struct DStr *str);
 
 /** Append formatted string (just as sprintf)*/
-int uc_dstr_sprintf(struct DStr *str, const char *fmt, ...) __attribute__((format(printf,2,3)));
+int uc_dstr_sprintf(struct DStr *str, const char *restrict fmt, ...) __attribute__((format(printf,2,3)));
 
 /** va_list variant */
-int uc_dstr_vsprintf(struct DStr *str, const char *fmt, va_list ap_)__attribute__((format(printf,2,0)));
+int uc_dstr_vsprintf(struct DStr *str, const char *restrict fmt, va_list ap_)__attribute__((format(printf,2,0)));
 
 #ifdef __cplusplus
 }
diff --git a/include/ucore/mbuf.h b/include/ucore/mbuf.h
index c73cd36..73dc17e 100644
--- a/include/ucore/mbuf.h
+++ b/include/ucore/mbuf.h
@@ -125,7 +125,7 @@ struct MBuf *uc_mbuf_copy_data(struct MBuf *mbuf);
  * @param headroom the headroom in the buffer
  * @param flags The appropriate UC_MBUF_FLAGS
  */
-void uc_mbuf_init(struct MBuf *mbuf, uint8_t *buf, uint32_t len, uint32_t headroom, uint32_t flags);
+void uc_mbuf_init(struct MBuf *mbuf, uint8_t *restrict buf, uint32_t len, uint32_t headroom, uint32_t flags);
 
 /** Zero out all the data in this mbuf, including the headroom
  *
diff --git a/include/ucore/string.h b/include/ucore/string.h
index 7914f01..f1269fb 100644
--- a/include/ucore/string.h
+++ b/include/ucore/string.h
@@ -18,7 +18,7 @@ extern "C" {
  * @param out where to store result. Must hold at least len * 2 + 1
  * @return returns one past the end of the converted data
  */
-char* uc_hex_encode(const uint8_t *in, size_t len, char *out);
+char* uc_hex_encode(const uint8_t *restrict in, size_t len, char *restrict out);
 
 /** Decode hex. Will stop at the first non-convertible hex-digit
  * spaces(' ','\t,'\r','\n') in input are skipped
@@ -32,11 +32,11 @@ char* uc_hex_encode(const uint8_t *in, size_t len, char *out);
  * @param out where to store result. Must hold at least maxlen/2 + 1
  * @return returns one past the end of the converted data
  */
-uint8_t* uc_hex_decode(const char *in, size_t maxlen,uint8_t *out);
+uint8_t* uc_hex_decode(const char *restrict in, size_t maxlen,uint8_t *restrict out);
 /** As uc_hex_encode , but inserts the @delim string between each converted
  *  byte (each 2 hex chars)
  */
-char* uc_hex_encode_delim(const uint8_t *in, size_t inlen, char *out, int outlen, const char *delim);
+char* uc_hex_encode_delim(const uint8_t *restrict in, size_t inlen, char *restrict out, int outlen, const char *restrict delim);
 
 /**
  * Convert the string to lowercase, calls tolower() on each char.
@@ -67,7 +67,7 @@ void uc_str_toupper(char *s);
  *        if the number of ASCII digits is odd. This would usually be 0x0 or 0xf.
  * @return the number of bytes written to bcdout
  */
-size_t uc_ascii2bcd(const char *ascii, unsigned char *bcdout, unsigned char filler);
+size_t uc_ascii2bcd(const char *restrict ascii, unsigned char *restrict bcdout, unsigned char filler);
 
 /** Convert the BCD digits to ascii.
  * The resulting ascii string is 0 terminated.
@@ -77,7 +77,7 @@ size_t uc_ascii2bcd(const char *ascii, unsigned char *bcdout, unsigned char fill
  * @param asciiout buffer to place ASCII in, must be UC_ASCII_LEN(bcdlen)+1 big
  * @return the number of characters written to bcdout (this will always be UC_ASCII_LEN(bcdlen)
  */
-size_t uc_bcd2ascii(const unsigned char *bcd, size_t bcdlen, char *asciiout);
+size_t uc_bcd2ascii(const unsigned char *restrict bcd, size_t bcdlen, char *restrict asciiout);
 
 /** uc_sprintb for converting the values into ascii bit representation
  * e.g. 0x3 -> "00000011". The result must be able to hold the max number
@@ -111,7 +111,7 @@ char * uc_human_bytesz_bin(uint64_t bytes, char *result, size_t result_len);
  *            is normally the size of the dst buffer)
  * return strlen(src) which may be larger than the no. of bytes copied.
  */
-size_t uc_strlcpy(char *dst, const char *src, size_t max);
+size_t uc_strlcpy(char *restrict dst, const char *restrict src, size_t max);
 
 #ifdef __cplusplus
 }
diff --git a/include/ucore/strvec.h b/include/ucore/strvec.h
index c854161..f4be722 100644
--- a/include/ucore/strvec.h
+++ b/include/ucore/strvec.h
@@ -52,7 +52,7 @@ int uc_strv_check_expand(struct UCStrv *strv);
  * @param str String to append, the string will be copied.
  * @return 0 on success, otherwise failure
  **/ 
-int uc_strv_append(struct UCStrv *strv, const char *str);
+int uc_strv_append(struct UCStrv *strv, const char *restrict str);
 
 /**
  * Append a string to the strvec, nocopy variang.  
@@ -63,7 +63,7 @@ int uc_strv_append(struct UCStrv *strv, const char *str);
  * @param str the string to append
  * @return 0 on success, otherwise failure
  **/ 
-int uc_strv_append_nocopy(struct UCStrv *strv, char *str);
+int uc_strv_append_nocopy(struct UCStrv *strv, char *restrict str);
 
 /**
  * Append a NULL pointer to the UCStrv, (cnt is not increased,
@@ -98,7 +98,7 @@ void uc_strv_destroy(struct UCStrv *strv);
  *        0 to just append the same pointer in b to a
  * @return 0 on success, != 0 if appending/allocation fails
  */
-int uc_strv_append_all(struct UCStrv *a, struct UCStrv *b, int copy);
+int uc_strv_append_all(struct UCStrv *restrict a, struct UCStrv *restrict b, int copy);
 
 #ifdef __cplusplus
 }
diff --git a/include/ucore/val_str.h b/include/ucore/val_str.h
index 9e180b5..9ee6cae 100644
--- a/include/ucore/val_str.h
+++ b/include/ucore/val_str.h
@@ -48,6 +48,6 @@ const char *uc_val_2_str_bs(unsigned int val,
  * @param array array to search
  * @return the string associated with @val or null
  */
-const char *uc_str_2_str(const char *val, const struct UCStrStr *array);
+const char *uc_str_2_str(const char *restrict val, const struct UCStrStr *array);
 
 #endif
diff --git a/src/bcd.c b/src/bcd.c
index 4cfb9ff..7590656 100644
--- a/src/bcd.c
+++ b/src/bcd.c
@@ -4,7 +4,7 @@
 #include "ucore/string.h"
 
 size_t 
-uc_ascii2bcd(const char *ascii, unsigned char *bcdout, unsigned char filler)
+uc_ascii2bcd(const char *restrict ascii, unsigned char *restrict bcdout, unsigned char filler)
 {
     unsigned char *bcdp = bcdout;
     int shift = 0;
@@ -36,7 +36,7 @@ uc_ascii2bcd(const char *ascii, unsigned char *bcdout, unsigned char filler)
 
 static const char hex[] = "0123456789ABCDEF";
 size_t 
-uc_bcd2ascii(const unsigned char *bcd, size_t bcdlen, char *asciiout)
+uc_bcd2ascii(const unsigned char *restrict bcd, size_t bcdlen, char *restrict asciiout)
 {
     size_t i;
     size_t idx = 0;
diff --git a/src/dstr.c b/src/dstr.c
index a9ddf4d..99be0bc 100644
--- a/src/dstr.c
+++ b/src/dstr.c
@@ -106,7 +106,7 @@ char *uc_dstr_put(struct DStr *str, size_t len)
     return start;
 }
 
-size_t uc_dstr_put_str_filter(struct DStr *str, const char *s, int (*is_x)(int c))
+size_t uc_dstr_put_str_filter(struct DStr *str, const char *restrict s, int (*is_x)(int c))
 {
     size_t len = strlen(s);
     size_t i;
@@ -128,7 +128,7 @@ size_t uc_dstr_put_str_filter(struct DStr *str, const char *s, int (*is_x)(int c
     return idx;
 }
 
-int uc_dstr_put_str_sz(struct DStr *str, const char *s, size_t len)
+int uc_dstr_put_str_sz(struct DStr *str, const char *restrict s, size_t len)
 {
     char *start = uc_dstr_put(str, len);
 
@@ -140,7 +140,7 @@ int uc_dstr_put_str_sz(struct DStr *str, const char *s, size_t len)
     return 0;
 }
 
-int uc_dstr_put_str(struct DStr *str, const char *s)
+int uc_dstr_put_str(struct DStr *str, const char *restrict s)
 {
     size_t len = strlen(s);
 
@@ -159,7 +159,7 @@ int uc_dstr_put_char(struct DStr *str, char c)
     return 0;
 }
 
-void uc_dstr_own(struct DStr *str, char *s)
+void uc_dstr_own(struct DStr *str, char *restrict s)
 {
     size_t len = strlen(s);
 
@@ -181,7 +181,7 @@ char *uc_dstr_steal(struct DStr *str)
     return s;
 }
 
-void uc_str_swap(struct DStr *a, struct DStr *b)
+void uc_str_swap(struct DStr *restrict a, struct DStr *restrict b)
 {
     struct DStr tmp;
 
@@ -236,7 +236,7 @@ void uc_dstr_trim(struct DStr *str)
     }
 }
 
-int uc_dstr_sprintf(struct DStr *str, const char *fmt, ...)
+int uc_dstr_sprintf(struct DStr *str, const char *restrict fmt, ...)
 {
     va_list ap;
     int rc;
@@ -248,7 +248,7 @@ int uc_dstr_sprintf(struct DStr *str, const char *fmt, ...)
     return rc;
 }
 
-int uc_dstr_vsprintf(struct DStr *str, const char *fmt, va_list ap_)
+int uc_dstr_vsprintf(struct DStr *str, const char *restrict fmt, va_list ap_)
 {
     va_list ap;
     int rc;
diff --git a/src/hex.c b/src/hex.c
index b2a162d..1b01ad9 100644
--- a/src/hex.c
+++ b/src/hex.c
@@ -8,7 +8,7 @@
 static const char hx_chars[] = "0123456789ABCDEF" ;
 
 char*
-uc_hex_encode(const uint8_t *in, size_t len, char *out)
+uc_hex_encode(const uint8_t *restrict in, size_t len, char *restrict out)
 {
     unsigned int i, t;
 
@@ -28,7 +28,7 @@ uc_hex_encode(const uint8_t *in, size_t len, char *out)
 }
 
 char*
-uc_hex_encode_delim(const uint8_t *in, size_t inlen, char *out, int outlen, const char *delim)
+uc_hex_encode_delim(const uint8_t *restrict in, size_t inlen, char *restrict out, int outlen, const char *restrict delim)
 {
     size_t i;
     char *outp = out;
@@ -76,7 +76,7 @@ static inline int char_to_bin(char c)
 }
 
 uint8_t*
-uc_hex_decode(const char *in, size_t maxlen,uint8_t *out)
+uc_hex_decode(const char *restrict in, size_t maxlen,uint8_t *restrict out)
 {
     size_t i, t;
 
diff --git a/src/mbuf.c b/src/mbuf.c
index 4dd52e1..b4ab023 100644
--- a/src/mbuf.c
+++ b/src/mbuf.c
@@ -40,7 +40,7 @@ uint8_t *uc_mbuf_pull(struct MBuf *mbuf, uint32_t size)
     return data;
 }
 
-void uc_mbuf_init(struct MBuf *mbuf, uint8_t *buf, uint32_t len, uint32_t headroom, uint32_t flags)
+void uc_mbuf_init(struct MBuf *mbuf, uint8_t *restrict buf, uint32_t len, uint32_t headroom, uint32_t flags)
 {
     mbuf->bufstart  = buf;
     mbuf->p1        = mbuf->p2 = mbuf->p3 = mbuf->p4 = NULL;
diff --git a/src/strlcpy.c b/src/strlcpy.c
index dc67290..6f9682a 100644
--- a/src/strlcpy.c
+++ b/src/strlcpy.c
@@ -1,6 +1,6 @@
 #include <string.h>
 
-size_t uc_strlcpy(char *dst, const char *src, size_t max)
+size_t uc_strlcpy(char *restrict dst, const char *restrict src, size_t max)
 {
     size_t len = strlen(src);
 
diff --git a/src/strvec.c b/src/strvec.c
index 276a0be..1e9f00a 100644
--- a/src/strvec.c
+++ b/src/strvec.c
@@ -36,7 +36,7 @@ int uc_strv_check_expand(struct UCStrv *strv)
     return rc;
 }
 
-int uc_strv_append(struct UCStrv *strv, const char *str)
+int uc_strv_append(struct UCStrv *strv, const char *restrict str)
 {
     int rc;
     char *dup;
@@ -57,7 +57,7 @@ int uc_strv_append(struct UCStrv *strv, const char *str)
     return 0;
 }
 
-int uc_strv_append_nocopy(struct UCStrv *strv, char *str)
+int uc_strv_append_nocopy(struct UCStrv *strv, char *restrict str)
 {
     int rc;
     rc = uc_strv_check_expand(strv);
@@ -105,7 +105,7 @@ void uc_strv_destroy(struct UCStrv *strv)
     strv->strings = NULL;
 }
 
-int uc_strv_append_all(struct UCStrv *a, struct UCStrv *b, int copy)
+int uc_strv_append_all(struct UCStrv *restrict a, struct UCStrv *restrict b, int copy)
 {
     size_t i;
     int rc;
diff --git a/src/val_str.c b/src/val_str.c
index 4ff0fe0..ea92321 100644
--- a/src/val_str.c
+++ b/src/val_str.c
@@ -47,7 +47,7 @@ const char *uc_val_2_str_bs(unsigned int val,
     return found;
 }
 
-const char *uc_str_2_str(const char *val, const struct UCStrStr *array)
+const char *uc_str_2_str(const char *restrict val, const struct UCStrStr *array)
 {
     const char *found = NULL;