06423cab58
This is a new flash installer framework for the X1000 targets. A bunch of this code is *UNTESTED* but there is an external test harness which allows the library to be built and tested on a PC. Once tests are written and the bugs are ironed out this framework will replace the existing installer code. New features: - Update tarballs are MD5-checksummed to guarantee integrity. - The flash map is no longer fixed -- updates are self describing and carry a map file which specifies the areas to update. - Can take full or partial backups with checksums computed on the fly. - Supports an additional verification mode which reads back data after writing to ensure the flash contents were not silently corrupted. Change-Id: I29a89190c7ff566019f6a844ad0571f01fb7192f
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2014 by Michael Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "pathfuncs.h"
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#include "strlcpy.h"
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#include "system.h"
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#include <string.h>
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static const char* GOBBLE_PATH_SEPCH(const char* p)
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{
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int c;
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while((c = *p) == PATH_SEPCH)
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++p;
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return p;
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}
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static const char* GOBBLE_PATH_COMP(const char* p)
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{
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int c;
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while((c = *p) && c != PATH_SEPCH)
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++p;
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return p;
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}
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/* Strips the trailing component from the path
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* "" *nameptr->NUL, len=0: ""
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* "/" *nameptr->/, len=1: "/"
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* "//" *nameptr->2nd /, len=1: "/"
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* "/a" *nameptr->/, len=1: "/"
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* "a/" *nameptr->a, len=0: ""
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* "/a/bc" *nameptr->/, len=2: "/a"
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* "d" *nameptr->d, len=0: ""
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* "ef/gh" *nameptr->e, len=2: "ef"
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*
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* Notes: * Interpret len=0 as ".".
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* * In the same string, path_dirname() returns a pointer with the
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* same or lower address as path_basename().
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* * Pasting a separator between the returns of path_dirname() and
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* path_basename() will result in a path equivalent to the input.
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*
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*/
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size_t path_dirname(const char *name, const char **nameptr)
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{
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const char *p = GOBBLE_PATH_SEPCH(name);
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const char *q = name;
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const char *r = p;
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while (*(p = GOBBLE_PATH_COMP(p)))
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{
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const char *s = p;
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if (!*(p = GOBBLE_PATH_SEPCH(p)))
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break;
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q = s;
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}
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if (q == name && r > name)
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name = r, q = name--; /* root - return last slash */
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*nameptr = name;
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return q - name;
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}
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/* Appends one path to another, adding separators between components if needed.
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* Return value and behavior is otherwise as strlcpy so that truncation may be
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* detected.
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*
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* For basepath and component:
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* PA_SEP_HARD adds a separator even if the base path is empty
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* PA_SEP_SOFT adds a separator only if the base path is not empty
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*/
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size_t path_append(char *buf, const char *basepath,
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const char *component, size_t bufsize)
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{
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const char *base = basepath && basepath[0] ? basepath : buf;
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if (!base)
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return bufsize; /* won't work to get lengths from buf */
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if (!buf)
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bufsize = 0;
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if (path_is_absolute(component))
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{
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/* 'component' is absolute; replace all */
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basepath = component;
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component = "";
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}
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/* if basepath is not null or empty, buffer contents are replaced,
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otherwise buf contains the base path */
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size_t len = base == buf ? strlen(buf) : my_strlcpy(buf, basepath, bufsize);
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bool separate = false;
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if (!basepath || !component)
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separate = !len || base[len-1] != PATH_SEPCH;
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else if (component[0])
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separate = len && base[len-1] != PATH_SEPCH;
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/* caller might lie about size of buf yet use buf as the base */
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if (base == buf && bufsize && len >= bufsize)
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buf[bufsize - 1] = '\0';
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buf += len;
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bufsize -= MIN(len, bufsize);
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if (separate && (len++, bufsize > 0) && --bufsize > 0)
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*buf++ = PATH_SEPCH;
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return len + my_strlcpy(buf, component ?: "", bufsize);
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}
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