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/*

* Utilities library for libgit2 examples

*

* Written by the libgit2 contributors

*

* To the extent possible under law, the author(s) have dedicated all copyright

* and related and neighboring rights to this software to the public domain

* worldwide. This software is distributed without any warranty.

*

* You should have received a copy of the CC0 Public Domain Dedication along

* with this software. If not, see

* <http://creativecommons.org/publicdomain/zero/1.0/>.

*/

#include "common.h"

void check_lg2(int error, const char *message, const char *extra)

{

const git_error *lg2err;

const char *lg2msg = "", *lg2spacer = "";

if (!error)

return;

if ((lg2err = giterr_last()) != NULL && lg2err->message != NULL) {

lg2msg = lg2err->message;

lg2spacer = " - ";

}

if (extra)

fprintf(stderr, "%s '%s' [%d]%s%s\n",

message, extra, error, lg2spacer, lg2msg);

else

fprintf(stderr, "%s [%d]%s%s\n",

message, error, lg2spacer, lg2msg);

exit(1);

}

void fatal(const char *message, const char *extra)

{

if (extra)

fprintf(stderr, "%s %s\n", message, extra);

else

fprintf(stderr, "%s\n", message);

exit(1);

}

size_t is_prefixed(const char *str, const char *pfx)

{

size_t len = strlen(pfx);

return strncmp(str, pfx, len) ? 0 : len;

}

int optional_str_arg(

const char **out, struct args_info *args, const char *opt, const char *def)

{

const char *found = args->argv[args->pos];

size_t len = is_prefixed(found, opt);

if (!len)

return 0;

if (!found[len]) {

if (args->pos + 1 == args->argc) {

*out = def;

return 1;

}

args->pos += 1;

*out = args->argv[args->pos];

return 1;

}

if (found[len] == '=') {

*out = found + len + 1;

return 1;

}

return 0;

}

int match_str_arg(

const char **out, struct args_info *args, const char *opt)

{

const char *found = args->argv[args->pos];

size_t len = is_prefixed(found, opt);

if (!len)

return 0;

if (!found[len]) {

if (args->pos + 1 == args->argc)

fatal("expected value following argument", opt);

args->pos += 1;

*out = args->argv[args->pos];

return 1;

}

if (found[len] == '=') {

*out = found + len + 1;

return 1;

}

return 0;

}

static const char *match_numeric_arg(struct args_info *args, const char *opt)

{

const char *found = args->argv[args->pos];

size_t len = is_prefixed(found, opt);

if (!len)

return NULL;

if (!found[len]) {

if (args->pos + 1 == args->argc)

fatal("expected numeric value following argument", opt);

args->pos += 1;

found = args->argv[args->pos];

} else {

found = found + len;

if (*found == '=')

found++;

}

return found;

}

int match_uint16_arg(

uint16_t *out, struct args_info *args, const char *opt)

{

const char *found = match_numeric_arg(args, opt);

uint16_t val;

char *endptr = NULL;

if (!found)

return 0;

val = (uint16_t)strtoul(found, &endptr, 0);

if (!endptr || *endptr != '\0')

fatal("expected number after argument", opt);

if (out)

*out = val;

return 1;

}

int match_uint32_arg(

uint32_t *out, struct args_info *args, const char *opt)

{

const char *found = match_numeric_arg(args, opt);

uint16_t val;

char *endptr = NULL;

if (!found)

return 0;

val = (uint32_t)strtoul(found, &endptr, 0);

if (!endptr || *endptr != '\0')

fatal("expected number after argument", opt);

if (out)

*out = val;

return 1;

}

static int match_int_internal(

int *out, const char *str, int allow_negative, const char *opt)

{

char *endptr = NULL;

int val = (int)strtol(str, &endptr, 10);

if (!endptr || *endptr != '\0')

fatal("expected number", opt);

else if (val < 0 && !allow_negative)

fatal("negative values are not allowed", opt);

if (out)

*out = val;

return 1;

}

int is_integer(int *out, const char *str, int allow_negative)

{

return match_int_internal(out, str, allow_negative, NULL);

}

int match_int_arg(

int *out, struct args_info *args, const char *opt, int allow_negative)

{

const char *found = match_numeric_arg(args, opt);

if (!found)

return 0;

return match_int_internal(out, found, allow_negative, opt);

}

int diff_output(

const git_diff_delta *d,

const git_diff_hunk *h,

const git_diff_line *l,

void *p)

{

FILE *fp = (FILE*)p;

(void)d; (void)h;

if (!fp)

fp = stdout;

if (l->origin == GIT_DIFF_LINE_CONTEXT ||

l->origin == GIT_DIFF_LINE_ADDITION ||

l->origin == GIT_DIFF_LINE_DELETION)

fputc(l->origin, fp);

fwrite(l->content, 1, l->content_len, fp);

return 0;

}

void treeish_to_tree(

git_tree **out, git_repository *repo, const char *treeish)

{

git_object *obj = NULL;

check_lg2(

git_revparse_single(&obj, repo, treeish),

"looking up object", treeish);

check_lg2(

git_object_peel((git_object **)out, obj, GIT_OBJ_TREE),

"resolving object to tree", treeish);

git_object_free(obj);

}