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21666f1aae
We currently have two parallel notation for dealing with object types in the code: a string and a numerical value. One of them is obviously redundent, and the most used one requires more stack space and a bunch of strcmp() all over the place. This is an initial step for the removal of the version using a char array found in object reading code paths. The patch is unfortunately large but there is no sane way to split it in smaller parts without breaking the system. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
118 lines
2.3 KiB
C
118 lines
2.3 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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xpparam_t xpp;
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int merge_status;
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memset(&xpp, 0, sizeof(xpp));
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merge_status = xdl_merge(base, our, ".our", their, ".their",
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&xpp, 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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xpp.flags = XDF_NEED_MINIMAL;
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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 xdl_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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