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00f8f97d30
So far we have only needed to be able to pass an option that is generic to xdiff family of functions to this function. Extend the interface so that we can give it merge specific parameters. Signed-off-by: Junio C Hamano <gitster@pobox.com>
120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include "xdiff-interface.h"
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#include "blob.h"
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static int fill_mmfile_blob(mmfile_t *f, struct blob *obj)
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{
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void *buf;
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unsigned long size;
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enum object_type type;
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buf = read_sha1_file(obj->object.sha1, &type, &size);
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if (!buf)
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return -1;
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if (type != OBJ_BLOB)
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return -1;
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f->ptr = buf;
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f->size = size;
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return 0;
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}
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static void free_mmfile(mmfile_t *f)
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{
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free(f->ptr);
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}
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static void *three_way_filemerge(mmfile_t *base, mmfile_t *our, mmfile_t *their, unsigned long *size)
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{
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mmbuffer_t res;
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xmparam_t xmp;
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int merge_status;
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memset(&xmp, 0, sizeof(xmp));
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merge_status = xdl_merge(base, our, ".our", their, ".their",
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&xmp, XDL_MERGE_ZEALOUS, &res);
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if (merge_status < 0)
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return NULL;
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*size = res.size;
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return res.ptr;
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}
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static int common_outf(void *priv_, mmbuffer_t *mb, int nbuf)
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{
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int i;
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mmfile_t *dst = priv_;
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for (i = 0; i < nbuf; i++) {
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memcpy(dst->ptr + dst->size, mb[i].ptr, mb[i].size);
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dst->size += mb[i].size;
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}
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return 0;
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}
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static int generate_common_file(mmfile_t *res, mmfile_t *f1, mmfile_t *f2)
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{
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unsigned long size = f1->size < f2->size ? f1->size : f2->size;
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void *ptr = xmalloc(size);
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xpparam_t xpp;
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xdemitconf_t xecfg;
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xdemitcb_t ecb;
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memset(&xpp, 0, sizeof(xpp));
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xpp.flags = XDF_NEED_MINIMAL;
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memset(&xecfg, 0, sizeof(xecfg));
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xecfg.ctxlen = 3;
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xecfg.flags = XDL_EMIT_COMMON;
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ecb.outf = common_outf;
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res->ptr = ptr;
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res->size = 0;
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ecb.priv = res;
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return xdi_diff(f1, f2, &xpp, &xecfg, &ecb);
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}
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void *merge_file(struct blob *base, struct blob *our, struct blob *their, unsigned long *size)
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{
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void *res = NULL;
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mmfile_t f1, f2, common;
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/*
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* Removed in either branch?
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*
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* NOTE! This depends on the caller having done the
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* proper warning about removing a file that got
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* modified in the other branch!
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*/
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if (!our || !their) {
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enum object_type type;
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if (base)
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return NULL;
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if (!our)
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our = their;
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return read_sha1_file(our->object.sha1, &type, size);
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}
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if (fill_mmfile_blob(&f1, our) < 0)
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goto out_no_mmfile;
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if (fill_mmfile_blob(&f2, their) < 0)
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goto out_free_f1;
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if (base) {
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if (fill_mmfile_blob(&common, base) < 0)
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goto out_free_f2_f1;
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} else {
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if (generate_common_file(&common, &f1, &f2) < 0)
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goto out_free_f2_f1;
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}
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res = three_way_filemerge(&common, &f1, &f2, size);
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free_mmfile(&common);
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out_free_f2_f1:
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free_mmfile(&f2);
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out_free_f1:
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free_mmfile(&f1);
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out_no_mmfile:
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return res;
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}
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