Inline code spans

src/inlines.c

@@ -0,0 +1,87 @@
+#include <string.h>
+
+#include <inlines.h>
+
+static const char *punctuation = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";
+struct escape {
+	char c;
+	char *code;
+};
+struct escape escapes[] = {
+	{'<', "&lt;"},
+	{'>', "&gt;"},
+	{'&', "&amp;"},
+};
+
+static int writecodespan(char *data, int i, size_t len, FILE *out);
+static void writeescaped(char *data, size_t len, FILE *out);
+static void writechescape(char c, FILE *out);
+
+void writeline(char *data, FILE *out) {
+	writedata(data, strlen(data), out);
+}
+
+void writedata(char *data, size_t len, FILE *out) {
+	int i;
+	for (i = 0; i < len; ++i) {
+		int newi;
+		if ((newi = writecodespan(data, i, len, out)) >= 0)
+			goto special;
+		if (data[i] == '\\') {
+			if (strchr(punctuation, data[i + 1]) == NULL)
+				writechescape('\\', out);
+			++i;
+		}
+		writechescape(data[i], out);
+		continue;
+special:
+		i = newi - 1;
+	}
+}
+
+static int writecodespan(char *data, int i, size_t len, FILE *out) {
+	int ticklen;
+	int start, end;
+
+	if (data[i] != '`')
+		return -1;
+	for (ticklen = 0; data[i + ticklen] == '`'; ++ticklen) ;
+
+	start = i + ticklen;
+	for (end = start; end < len; ++end) {
+		int thislen;
+		if (data[end] != '`')
+			continue;
+		for (thislen = 0; data[end + thislen] == '`'; ++thislen);
+		if (ticklen == thislen)
+			break;
+		end += thislen - 1;
+	}
+	if (end >= len) {
+		for (i = 0; i < ticklen; ++i)
+			fputc('`', out);
+		return start + ticklen;
+	}
+
+	fputs("<code>", out);
+	writeescaped(data + start, end - start, out);
+	fputs("</code>", out);
+	return end + ticklen;
+}
+
+static void writeescaped(char *data, size_t len, FILE *out) {
+	int i;
+	for (i = 0; i < len; ++i)
+		writechescape(data[i], out);
+}
+
+static void writechescape(char c, FILE *out) {
+	int i;
+	for (i = 0; i < sizeof escapes / sizeof *escapes; ++i) {
+		if (escapes[i].c == c) {
+			fputs(escapes[i].code, out);
+			return;
+		}
+	}
+	fputc(c, out);
+}