diff options
Diffstat (limited to 'resolve-undo.c')
| -rw-r--r-- | resolve-undo.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/resolve-undo.c b/resolve-undo.c new file mode 100644 index 0000000000..0f50ee0484 --- /dev/null +++ b/resolve-undo.c @@ -0,0 +1,176 @@ +#include "cache.h" +#include "dir.h" +#include "resolve-undo.h" +#include "string-list.h" + +/* The only error case is to run out of memory in string-list */ +void record_resolve_undo(struct index_state *istate, struct cache_entry *ce) +{ + struct string_list_item *lost; + struct resolve_undo_info *ui; + struct string_list *resolve_undo; + int stage = ce_stage(ce); + + if (!stage) + return; + + if (!istate->resolve_undo) { + resolve_undo = xcalloc(1, sizeof(*resolve_undo)); + resolve_undo->strdup_strings = 1; + istate->resolve_undo = resolve_undo; + } + resolve_undo = istate->resolve_undo; + lost = string_list_insert(ce->name, resolve_undo); + if (!lost->util) + lost->util = xcalloc(1, sizeof(*ui)); + ui = lost->util; + hashcpy(ui->sha1[stage - 1], ce->sha1); + ui->mode[stage - 1] = ce->ce_mode; +} + +static int write_one(struct string_list_item *item, void *cbdata) +{ + struct strbuf *sb = cbdata; + struct resolve_undo_info *ui = item->util; + int i; + + if (!ui) + return 0; + strbuf_addstr(sb, item->string); + strbuf_addch(sb, 0); + for (i = 0; i < 3; i++) + strbuf_addf(sb, "%o%c", ui->mode[i], 0); + for (i = 0; i < 3; i++) { + if (!ui->mode[i]) + continue; + strbuf_add(sb, ui->sha1[i], 20); + } + return 0; +} + +void resolve_undo_write(struct strbuf *sb, struct string_list *resolve_undo) +{ + for_each_string_list(write_one, resolve_undo, sb); +} + +struct string_list *resolve_undo_read(const char *data, unsigned long size) +{ + struct string_list *resolve_undo; + size_t len; + char *endptr; + int i; + + resolve_undo = xcalloc(1, sizeof(*resolve_undo)); + resolve_undo->strdup_strings = 1; + + while (size) { + struct string_list_item *lost; + struct resolve_undo_info *ui; + + len = strlen(data) + 1; + if (size <= len) + goto error; + lost = string_list_insert(data, resolve_undo); + if (!lost->util) + lost->util = xcalloc(1, sizeof(*ui)); + ui = lost->util; + size -= len; + data += len; + + for (i = 0; i < 3; i++) { + ui->mode[i] = strtoul(data, &endptr, 8); + if (!endptr || endptr == data || *endptr) + goto error; + len = (endptr + 1) - (char*)data; + if (size <= len) + goto error; + size -= len; + data += len; + } + + for (i = 0; i < 3; i++) { + if (!ui->mode[i]) + continue; + if (size < 20) + goto error; + hashcpy(ui->sha1[i], (const unsigned char *)data); + size -= 20; + data += 20; + } + } + return resolve_undo; + +error: + string_list_clear(resolve_undo, 1); + error("Index records invalid resolve-undo information"); + return NULL; +} + +void resolve_undo_clear_index(struct index_state *istate) +{ + struct string_list *resolve_undo = istate->resolve_undo; + if (!resolve_undo) + return; + string_list_clear(resolve_undo, 1); + free(resolve_undo); + istate->resolve_undo = NULL; + istate->cache_changed = 1; +} + +int unmerge_index_entry_at(struct index_state *istate, int pos) +{ + struct cache_entry *ce; + struct string_list_item *item; + struct resolve_undo_info *ru; + int i, err = 0; + + if (!istate->resolve_undo) + return pos; + + ce = istate->cache[pos]; + if (ce_stage(ce)) { + /* already unmerged */ + while ((pos < istate->cache_nr) && + ! strcmp(istate->cache[pos]->name, ce->name)) + pos++; + return pos - 1; /* return the last entry processed */ + } + item = string_list_lookup(ce->name, istate->resolve_undo); + if (!item) + return pos; + ru = item->util; + if (!ru) + return pos; + remove_index_entry_at(istate, pos); + for (i = 0; i < 3; i++) { + struct cache_entry *nce; + if (!ru->mode[i]) + continue; + nce = make_cache_entry(ru->mode[i], ru->sha1[i], + ce->name, i + 1, 0); + if (add_index_entry(istate, nce, ADD_CACHE_OK_TO_ADD)) { + err = 1; + error("cannot unmerge '%s'", ce->name); + } + } + if (err) + return pos; + free(ru); + item->util = NULL; + return unmerge_index_entry_at(istate, pos); +} + +void unmerge_index(struct index_state *istate, const char **pathspec) +{ + int i; + + if (!istate->resolve_undo) + return; + + for (i = 0; i < istate->cache_nr; i++) { + struct cache_entry *ce = istate->cache[i]; + if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, NULL)) + continue; + i = unmerge_index_entry_at(istate, i); + } +} |