Add alias file parsing function

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 119 insertions, 0 deletions

diff --git a/libfonts_parse_alias_line.c b/libfonts_parse_alias_line.c
new file mode 100644
index 0000000..844a400
--- /dev/null
+++ b/libfonts_parse_alias_line.c
@@ -0,0 +1,119 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+
+int
+libfonts_parse_alias_line(char **aliasp, char **namep, const char *line, char **endp)
+{
+	const char *alias_start;
+	const char *alias_end;
+	const char *name_start;
+	const char *name_end;
+	int ret = 0;
+	size_t len;
+
+	if (aliasp)
+		*aliasp = NULL;
+	if (namep)
+		*namep = NULL;
+
+	while (isblank(*line))
+		line++;
+
+	if (!*line || *line == '!')
+		goto out;
+
+	if (*line == '"') {
+		alias_start = ++line;
+		while (*line && *line != '\n' && *line != '"')
+			line++;
+		if (*line != '"')
+			goto ebadmsg;
+		alias_end = line++;
+	} else {
+		alias_start = line;
+		while (*line && *line != '\n' && isblank(*line))
+			line++;
+		alias_end = line;
+	}
+
+	if (!isblank(*line))
+		goto ebadmsg;
+	do {
+		line++;
+	} while (isblank(*line));
+
+	if (*line == '"') {
+		name_start = ++line;
+		while (*line && *line != '\n' && *line != '"')
+			line++;
+		if (*line != '"')
+			goto ebadmsg;
+		name_end = line++;
+	} else {
+		name_start = line;
+		while (*line && *line != '\n' && isblank(*line))
+			line++;
+		name_end = line;
+	}
+
+	while (isblank(*line))
+		line++;
+	if (*line && *line != '\n')
+		goto ebadmsg;
+
+	if (aliasp) {
+		len = (size_t)(alias_end - alias_start);
+		*aliasp = malloc(len + 1);
+		if (!*aliasp)
+			goto enomem;
+		memcpy(*aliasp, alias_start, len);
+		(*aliasp)[len] = '\0';
+	}
+
+	if (namep) {
+		len = (size_t)(name_end - name_start);
+		*namep = malloc(len + 1);
+		if (!*namep)
+			goto enomem;
+		memcpy(*namep, name_start, len);
+		(*namep)[len] = '\0';
+	}
+
+	*endp = *(char **)(void *)&line;
+	return 1;
+
+ebadmsg:
+	errno = EBADMSG;
+	ret = -1;
+out:
+	while (*line && *line != '\n')
+		line++;
+out_at_end:
+	if (endp)
+		*endp = *(char **)(void *)&line;
+	return ret;
+
+enomem:
+	if (aliasp) {
+		free(*aliasp);
+		*aliasp = NULL;
+	}
+	errno = ENOMEM;
+	ret = -1;
+	goto out_at_end;
+}
+
+
+#else
+
+
+int
+main(void)
+{
+	return 0; /* XXX add test */
+}
+
+
+#endif