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AP_Param: fixed some compiler warnings 

* added comment
* replaced "~0" with the appropriate macro
* resolved -Wconversion
* saved some space by modifying AP_Param::add_vector_suffix (writing
behind buffer could happen, if buffer_size is almost uint16_max but this
can surely be ignored)

further reading:
http://stackoverflow.com/questions/809227/is-it-safe-to-use-1-to-set-all-bits-to-true
This commit is contained in:
Tobias 2013-05-24 16:30:22 +02:00 committed by Andrew Tridgell
parent ab311d1dd4
commit 27a5c28851
1 changed files with 16 additions and 18 deletions
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30
libraries/AP_Param/AP_Param.cpp
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@ -443,7 +443,8 @@ uint8_t AP_Param::type_size(enum ap_var_type type)
// scan the EEPROM looking for a given variable by header content
// return true if found, along with the offset in the EEPROM where
// the variable is stored
// if not found return the offset of the sentinal, or
// if not found return the offset of the sentinal
// if the sentinal isn't found either, the offset is set to __UINT16_MAX__
bool AP_Param::scan(const AP_Param::Param_header *target, uint16_t *pofs)
{
struct Param_header phdr;
@ -468,31 +469,28 @@ bool AP_Param::scan(const AP_Param::Param_header *target, uint16_t *pofs)
}
ofs += type_size((enum ap_var_type)phdr.type) + sizeof(phdr);
}
*pofs = ~0;
*pofs = __UINT16_MAX__;
serialDebug("scan past end of eeprom");
return false;
}
// add a X,Y,Z suffix to the name of a Vector3f element
/**
* add a _X, _Y, _Z suffix to the name of a Vector3f element
* @param buffer
* @param buffer_size
* @param idx Suffix: 0 --> _X; 1 --> _Y; 2 --> _Z; (other --> undefined)
*/
void AP_Param::add_vector3f_suffix(char *buffer, size_t buffer_size, uint8_t idx) const
{
uint8_t len = strnlen(buffer, buffer_size);
if ((size_t)(len+2) > buffer_size) {
// the suffix doesn't fit
return;
}
const size_t len = strnlen(buffer, buffer_size);
if (len + 2 <= buffer_size) {
buffer[len] = '_';
if (idx == 0) {
buffer[len+1] = 'X';
} else if (idx == 1) {
buffer[len+1] = 'Y';
} else if (idx == 2) {
buffer[len+1] = 'Z';
}
if ((size_t)(len+2) < buffer_size) {
buffer[len + 1] = static_cast<char>('X' + idx);
if (len + 3 <= buffer_size) {
buffer[len + 2] = 0;
}
}
}
// Copy the variable's whole name to the supplied buffer.
//