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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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tool/decode/lib/flagger.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/arraylist.h"
#include "libc/fmt/fmt.h"
#include "libc/mem/mem.h"
#include "libc/str/str.h"
#include "tool/decode/lib/flagger.h"
struct FlagNameBuf {
size_t i, n;
char *p;
};
/**
* Formats numeric flags integer as symbolic code.
*
* @param names maps individual flags to string names in no order
* @param id is the flags
* @return NUL-terminated string that needs free()
*/
nodiscard char *recreateflags(const struct IdName *names, unsigned long id) {
struct FlagNameBuf buf = {};
char extrabuf[20];
bool first;
first = true;
for (; names->name; names++) {
if ((id == 0 && names->id == 0) ||
(id != 0 && names->id != 0 && (id & names->id) == names->id)) {
id &= ~names->id;
if (!first) {
append(&buf, "|");
} else {
first = false;
}
concat(&buf, names->name, strlen(names->name));
}
}
if (id) {
if (buf.i) append(&buf, "|");
concat(&buf, extrabuf, snprintf(extrabuf, sizeof(extrabuf), "%#x", id));
} else if (!buf.i) {
append(&buf, "0");
}
return buf.p;
}