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/*
* Copyright 2004-2024 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <stdio.h> // snprintf(), NULL
#include <string.h> // strcpy(), strdup()
#include <sys/types.h> // size_t
int pcmk__score_red = 0;
int pcmk__score_green = 0;
int pcmk__score_yellow = 0;
/*!
* \brief Get the integer value of a score string
*
* Given a string representation of a score, return the integer equivalent.
* This accepts infinity strings as well as red, yellow, and green, and
* bounds the result to +/-INFINITY.
*
* \param[in] score Score as string
*
* \return Integer value corresponding to \p score
*/
int
char2score(const char *score)
{
if (score == NULL) {
return 0;
} else if (pcmk_str_is_minus_infinity(score)) {
return -PCMK_SCORE_INFINITY;
} else if (pcmk_str_is_infinity(score)) {
return PCMK_SCORE_INFINITY;
} else if (pcmk__str_eq(score, PCMK_VALUE_RED, pcmk__str_casei)) {
return pcmk__score_red;
} else if (pcmk__str_eq(score, PCMK_VALUE_YELLOW, pcmk__str_casei)) {
return pcmk__score_yellow;
} else if (pcmk__str_eq(score, PCMK_VALUE_GREEN, pcmk__str_casei)) {
return pcmk__score_green;
} else {
long long score_ll;
pcmk__scan_ll(score, &score_ll, 0LL);
if (score_ll > PCMK_SCORE_INFINITY) {
return PCMK_SCORE_INFINITY;
} else if (score_ll < -PCMK_SCORE_INFINITY) {
return -PCMK_SCORE_INFINITY;
} else {
return (int) score_ll;
}
}
}
/*!
* \brief Return a displayable static string for a score value
*
* Given a score value, return a pointer to a static string representation of
* the score suitable for log messages, output, etc.
*
* \param[in] score Score to display
*
* \return Pointer to static memory containing string representation of \p score
* \note Subsequent calls to this function will overwrite the returned value, so
* it should be used only in a local context such as a printf()-style
* statement.
*/
const char *
pcmk_readable_score(int score)
{
// The longest possible result is "-INFINITY"
static char score_s[sizeof(PCMK_VALUE_MINUS_INFINITY)];
if (score >= PCMK_SCORE_INFINITY) {
strcpy(score_s, PCMK_VALUE_INFINITY);
} else if (score <= -PCMK_SCORE_INFINITY) {
strcpy(score_s, PCMK_VALUE_MINUS_INFINITY);
} else {
// Range is limited to +/-1000000, so no chance of overflow
snprintf(score_s, sizeof(score_s), "%d", score);
}
return score_s;
}
/*!
* \internal
* \brief Add two scores, bounding to +/-INFINITY
*
* \param[in] score1 First score to add
* \param[in] score2 Second score to add
*
* \note This function does not have context about what the scores mean, so it
* does not log any messages.
*/
int
pcmk__add_scores(int score1, int score2)
{
/* As long as PCMK_SCORE_INFINITY is less than half of the maximum integer,
* we can ignore the possibility of integer overflow.
*/
int result = score1 + score2;
// First handle the cases where one or both is infinite
if ((score1 <= -PCMK_SCORE_INFINITY) || (score2 <= -PCMK_SCORE_INFINITY)) {
return -PCMK_SCORE_INFINITY;
}
if ((score1 >= PCMK_SCORE_INFINITY) || (score2 >= PCMK_SCORE_INFINITY)) {
return PCMK_SCORE_INFINITY;
}
// Bound result to infinity.
if (result >= PCMK_SCORE_INFINITY) {
return PCMK_SCORE_INFINITY;
}
if (result <= -PCMK_SCORE_INFINITY) {
return -PCMK_SCORE_INFINITY;
}
return result;
}
// Deprecated functions kept only for backward API compatibility
// LCOV_EXCL_START
#include <crm/common/scores_compat.h>
char *
score2char(int score)
{
return pcmk__str_copy(pcmk_readable_score(score));
}
char *
score2char_stack(int score, char *buf, size_t len)
{
CRM_CHECK((buf != NULL) && (len >= sizeof(PCMK_VALUE_MINUS_INFINITY)),
return NULL);
strcpy(buf, pcmk_readable_score(score));
return buf;
}
// LCOV_EXCL_STOP
// End deprecated API
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