diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/make_patch.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/tools/make_patch.c b/tools/make_patch.c index d96bf216..82b018fd 100644 --- a/tools/make_patch.c +++ b/tools/make_patch.c @@ -183,6 +183,16 @@ int parse_arg_value(const char *arg, bool absolute, const struct Symbol *symbols return parse_number(arg, 0); } + // Symbols may take the low or high part + enum { SYM_WHOLE, SYM_LOW, SYM_HIGH } part = SYM_WHOLE; + if (arg[0] == '<') { + part = SYM_LOW; + arg++; + } else if (arg[0] == '>') { + part = SYM_HIGH; + arg++; + } + // Symbols evaluate to their offset or address, plus an optional offset mod int offset_mod = 0; char *plus = strchr(arg, '+'); @@ -190,9 +200,13 @@ int parse_arg_value(const char *arg, bool absolute, const struct Symbol *symbols offset_mod = parse_number(plus, 0); *plus = '\0'; } + + // Symbols evaluate to their offset or address const char *sym_name = !strcmp(arg, "@") ? patch_name : arg; // "@" is the current patch label const struct Symbol *symbol = symbol_find(symbols, sym_name); - return (absolute ? symbol->offset : symbol->address) + offset_mod; + + int value = (absolute ? symbol->offset : symbol->address) + offset_mod; + return part == SYM_LOW ? value & 0xff : part == SYM_HIGH ? value >> 8 : value; } void interpret_command(char *command, const struct Symbol *current_hook, const struct Symbol *symbols, struct Buffer *patches, FILE *restrict new_rom, FILE *restrict orig_rom, FILE *restrict output) { @@ -413,7 +427,7 @@ struct Buffer *process_template(const char *template_filename, const char *patch int compare_patch(const void *patch1, const void *patch2) { unsigned int offset1 = ((const struct Patch *)patch1)->offset; unsigned int offset2 = ((const struct Patch *)patch2)->offset; - return offset1 > offset2 ? 1 : offset1 < offset2 ? -1 : 0; + return (offset1 > offset2) - (offset1 < offset2); } bool verify_completeness(FILE *restrict orig_rom, FILE *restrict new_rom, struct Buffer *patches) { |