cmark

diff --git a/src/blocks.c b/src/blocks.c
@@ -348,7 +348,7 @@ static int parse_list_marker(cmark_chunk *input, int pos, cmark_list **dataptr)
 
 	if ((c == '*' || c == '-' || c == '+') && !scan_hrule(input, pos)) {
 		pos++;
-		if (!isspace(peek_at(input, pos))) {
+		if (!cmark_isspace(peek_at(input, pos))) {
 			return 0;
 		}
 		data = (cmark_list *)calloc(1, sizeof(*data));
@@ -362,18 +362,18 @@ static int parse_list_marker(cmark_chunk *input, int pos, cmark_list **dataptr)
 			data->delimiter = CMARK_PERIOD_DELIM;
 			data->tight = false;
 		}
-	} else if (isdigit(c)) {
+	} else if (cmark_isdigit(c)) {
 		int start = 0;
 
 		do {
 			start = (10 * start) + (peek_at(input, pos) - '0');
 			pos++;
-		} while (isdigit(peek_at(input, pos)));
+		} while (cmark_isdigit(peek_at(input, pos)));
 
 		c = peek_at(input, pos);
 		if (c == '.' || c == ')') {
 			pos++;
-			if (!isspace(peek_at(input, pos))) {
+			if (!cmark_isspace(peek_at(input, pos))) {
 				return 0;
 			}
 			data = (cmark_list *)calloc(1, sizeof(*data));

diff --git a/src/buffer.c b/src/buffer.c
@@ -308,7 +308,7 @@ void cmark_strbuf_rtrim(cmark_strbuf *buf)
 		return;
 
 	while (buf->size > 0) {
-		if (!isspace(buf->ptr[buf->size - 1]))
+		if (!cmark_isspace(buf->ptr[buf->size - 1]))
 			break;
 
 		buf->size--;
@@ -324,7 +324,7 @@ void cmark_strbuf_trim(cmark_strbuf *buf)
 	if (!buf->size)
 		return;
 
-	while (i < buf->size && isspace(buf->ptr[i]))
+	while (i < buf->size && cmark_isspace(buf->ptr[i]))
 		i++;
 
 	cmark_strbuf_drop(buf, i);
@@ -365,7 +365,7 @@ extern void cmark_strbuf_unescape(cmark_strbuf *buf)
 	int r, w;
 
 	for (r = 0, w = 0; r < buf->size; ++r) {
-		if (buf->ptr[r] == '\\' && ispunct(buf->ptr[r + 1]))
+		if (buf->ptr[r] == '\\' && cmark_ispunct(buf->ptr[r + 1]))
 			continue;
 
 		buf->ptr[w++] = buf->ptr[r];

diff --git a/src/chunk.h b/src/chunk.h
@@ -27,7 +27,7 @@ static inline void cmark_chunk_ltrim(cmark_chunk *c)
 {
 	assert(!c->alloc);
 
-	while (c->len && isspace(c->data[0])) {
+	while (c->len && cmark_isspace(c->data[0])) {
 		c->data++;
 		c->len--;
 	}
@@ -36,7 +36,7 @@ static inline void cmark_chunk_ltrim(cmark_chunk *c)
 static inline void cmark_chunk_rtrim(cmark_chunk *c)
 {
 	while (c->len > 0) {
-		if (!isspace(c->data[c->len - 1]))
+		if (!cmark_isspace(c->data[c->len - 1]))
 			break;
 
 		c->len--;

diff --git a/src/cmark_ctype.c b/src/cmark_ctype.c
@@ -1,7 +1,7 @@
 /**
  * Returns 1 if c is a "whitespace" character as defined by the spec.
  */
-int isspace(char c)
+int cmark_isspace(char c)
 {
 	return (c == 0x09 ||
 		c == 0x20 ||
@@ -12,7 +12,7 @@ int isspace(char c)
 /**
  * Returns 1 if c is an ascii punctuation character.
  */
-int ispunct(char c)
+int cmark_ispunct(char c)
 {
 	return ((c >= 33 && c <= 47) ||
 		(c >= 58 && c <= 64) ||
@@ -20,14 +20,14 @@ int ispunct(char c)
 		(c >= 123 && c <= 126));
 }
 
-int isalnum(char c)
+int cmark_isalnum(char c)
 {
 	return ((c >= 48 && c <= 57) ||
 		(c >= 65 && c <= 90) ||
 		(c >= 97 && c <= 122));
 }
 
-int isdigit(char c)
+int cmark_isdigit(char c)
 {
 	return (c >= 48 && c <= 57);
 }

diff --git a/src/cmark_ctype.h b/src/cmark_ctype.h
@@ -2,10 +2,10 @@
  * We want cmark to behave the same no matter what the system locale.
  */
 
-int isspace(char c);
+int cmark_isspace(char c);
 
-int ispunct(char c);
+int cmark_ispunct(char c);
 
-int isalnum(char c);
+int cmark_isalnum(char c);
 
-int isdigit(char c);
+int cmark_isdigit(char c);

diff --git a/src/inlines.c b/src/inlines.c
@@ -286,10 +286,10 @@ scan_delims(subject* subj, unsigned char c, bool * can_open, bool * can_close)
 		  !utf8proc_is_space(after_char) &&
 		  !utf8proc_is_punctuation(after_char));
 	if (c == '_') {
-		*can_open = *can_open &&
-			!(before_char < 128 && isalnum((char)before_char));
-		*can_close = *can_close &&
-			!(before_char < 128 && isalnum((char)after_char));
+		*can_open = *can_open && !(before_char < 128 &&
+					   cmark_isalnum((char)before_char));
+		*can_close = *can_close && !(before_char < 128 &&
+					     cmark_isalnum((char)after_char));
 	}
 	return numdelims;
 }
@@ -489,7 +489,7 @@ static cmark_node* handle_backslash(subject *subj)
 {
 	advance(subj);
 	unsigned char nextchar = peek_char(subj);
-	if (ispunct(nextchar)) {  // only ascii symbols and newline can be escaped
+	if (cmark_ispunct(nextchar)) {  // only ascii symbols and newline can be escaped
 		advance(subj);
 		return make_str(cmark_chunk_dup(&subj->input, subj->pos - 1, 1));
 	} else if (nextchar == '\n') {
@@ -645,7 +645,7 @@ static int link_label(subject* subj, cmark_chunk *raw_label)
 		if (c == '\\') {
 			advance(subj);
 			length++;
-			if (ispunct(peek_char(subj))) {
+			if (cmark_ispunct(peek_char(subj))) {
 				advance(subj);
 				length++;
 			}

diff --git a/src/utf8.c b/src/utf8.c
@@ -269,7 +269,7 @@ int utf8proc_is_space(int32_t uc)
 // matches anything in the P[cdefios] classes.
 int utf8proc_is_punctuation(int32_t uc)
 {
-	return ((uc < 128 && ispunct((char)uc)) ||
+	return ((uc < 128 && cmark_ispunct((char)uc)) ||
 		uc == 161 ||
 		uc == 167 ||
 		uc == 171 ||