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func_math: Add DIGIT_SUM function.

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Add a function (DIGIT_SUM) which returns the digit sum of a number.

Resolves: #1499

UserNote: The DIGIT_SUM function can be used to return the digit sum of
a number.
This commit is contained in:
Naveen Albert
2025-10-01 11:34:20 -04:00
parent f647f9dad9
commit f3eec24088
1 changed files with 50 additions and 0 deletions
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50
funcs/func_math.c
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@@ -177,6 +177,28 @@
</example>
</description>
</function>
<function name="DIGIT_SUM" language="en_US">
<since>
<version>23.1.0</version>
<version>22.7.0</version>
<version>20.17.0</version>
</since>
<synopsis>
Returns the sum of all the digits in a number.
</synopsis>
<syntax>
<parameter name="num" />
</syntax>
<description>
<para>Returns the numeric sum of all the individual digits in a number, summed up.</para>
<para>This can be useful for computing checksums based on the number,
where errors are typically digits being off by one.</para>
<example title="Get the sum of digits in 859">
same => n,Set(digitsum=${DIGIT_SUM(859)}) ; assigns digitsum=22
same => n,Set(checksum=$[${digitsum} % 10]) ; assigns checksum=2
</example>
</description>
</function>
***/
enum TypeOfFunctions {
@@ -634,6 +656,27 @@ static int acf_abs_exec(struct ast_channel *chan, const char *cmd,
return 0;
}
static int acf_digit_sum_exec(struct ast_channel *chan, const char *cmd,
char *parse, char *buffer, size_t buflen)
{
int sum = 0;
if (ast_strlen_zero(parse)) {
ast_log(LOG_WARNING, "Missing argument for number\n");
return -1;
}
for (; *parse; parse++) {
if (*parse < '0' || *parse > '9') {
continue;
}
sum += (*parse - '0');
}
snprintf(buffer, buflen, "%d", sum);
return 0;
}
static struct ast_custom_function math_function = {
.name = "MATH",
.read = math
@@ -667,6 +710,11 @@ static struct ast_custom_function acf_abs = {
.read_max = 12,
};
static struct ast_custom_function acf_digit_sum = {
.name = "DIGIT_SUM",
.read = acf_digit_sum_exec,
};
#ifdef TEST_FRAMEWORK
AST_TEST_DEFINE(test_MATH_function)
{
@@ -728,6 +776,7 @@ static int unload_module(void)
res |= ast_custom_function_unregister(&acf_min);
res |= ast_custom_function_unregister(&acf_max);
res |= ast_custom_function_unregister(&acf_abs);
res |= ast_custom_function_unregister(&acf_digit_sum);
AST_TEST_UNREGISTER(test_MATH_function);
return res;
@@ -743,6 +792,7 @@ static int load_module(void)
res |= ast_custom_function_register(&acf_min);
res |= ast_custom_function_register(&acf_max);
res |= ast_custom_function_register(&acf_abs);
res |= ast_custom_function_register(&acf_digit_sum);
AST_TEST_REGISTER(test_MATH_function);
return res;