diff options
| -rw-r--r-- | Makefile | 1 | ||||
| -rw-r--r-- | libfonts.h | 32 | ||||
| -rw-r--r-- | libfonts_parse_alias_line.c | 119 |
3 files changed, 152 insertions, 0 deletions
@@ -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 @@ -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 |