mercurial/mpatch.h

phabricator: don't abort if property writing fails during amending

Currently if one of the writediffproperty calls fails due to network issues
during the amending of commit messages to include the Diff. Rev. line, the
transaction is aborted and rolled back.  This means that the associations
between the commits and the DREVs are lost for any already amended commits
because the removal of the local tags isn't covered by the rollback.

Differential Revision: https://phab.mercurial-scm.org/D6835

#ifndef _HG_MPATCH_H_
#define _HG_MPATCH_H_

#define MPATCH_ERR_NO_MEM -3
#define MPATCH_ERR_CANNOT_BE_DECODED -2
#define MPATCH_ERR_INVALID_PATCH -1

struct mpatch_frag {
	int start, end, len;
	const char *data;
};

struct mpatch_flist {
	struct mpatch_frag *base, *head, *tail;
};

int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res);
ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l);
void mpatch_lfree(struct mpatch_flist *a);
int mpatch_apply(char *buf, const char *orig, ssize_t len,
                 struct mpatch_flist *l);
struct mpatch_flist *
mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t),
            ssize_t start, ssize_t end);

#endif