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-rw-r--r--Makefile1
-rw-r--r--libfonts.h32
-rw-r--r--libfonts_parse_alias_line.c119
3 files changed, 152 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index a76310f..27be8f9 100644
--- a/Makefile
+++ b/Makefile
@@ -29,6 +29,7 @@ PUBLIC_OBJ =\
libfonts_get_output_dpi.o\
libfonts_get_output_rendering_settings.o\
libfonts_get_subpixel_order_class.o\
+ libfonts_parse_alias_line.o\
libfonts_unget_subpixel_order_class.o\
libfonts_used_environs.o
diff --git a/libfonts.h b/libfonts.h
index a02bc19..3656d22 100644
--- a/libfonts.h
+++ b/libfonts.h
@@ -12,6 +12,12 @@
*/
#define LIBFONTS_CONTEXT_VERSION 0
+/**
+ * File name of file in font directories that is used
+ * to create font aliases
+ */
+#define LIBFONTS_ALIAS_FILE_NAME "fonts.alias"
+
#if defined(__clang__)
# pragma clang diagnostic push
@@ -1676,6 +1682,32 @@ extern const char *const libfonts_used_environs[];
*/
int libfonts_get_font_root_dirs(char ***, size_t *, struct libfonts_context *);
+/**
+ * Parse line from a font alias file
+ *
+ * Font alias files are named "fonts.alias" (`LIBFONTS_ALIAS_FILE_NAME`)
+ * and are located in any font directory, i.e. directories returned by
+ * `libfonts_get_font_root_dirs` subdirectors (and further decedents)
+ *
+ * @param aliasp Output parameter for the new alias
+ * @param namep Output parameter for the alias target,
+ * which can be ether a proper font name or an alias
+ * @param line The line to parse; parsing stops at the first
+ * newline or NUL byte
+ * @param endp Output parameter for the parsing end, i.e. the
+ * first newline or NUL byte in `line`
+ * @return 1 if the line included a font alias,
+ * 0 if the line was blank or a comment line,
+ * -1 on failure
+ *
+ * @throws ENOMEM Failed to allocate memory for `*aliasp` or `*namep`
+ * @throws EBADMSG The line is malformatted
+ *
+ * `*aliasp` and `*namep` are set to `NULL` unless the function
+ * returns 1; `*endp` is updated even on failure
+ */
+int libfonts_parse_alias_line(char **, char **, const char *, char **);
+
/* TODO add font listing */
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