From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/string%2Fbyte%2Fstrtol.html | 105 ---------------------------------- 1 file changed, 105 deletions(-) delete mode 100644 devdocs/c/string%2Fbyte%2Fstrtol.html (limited to 'devdocs/c/string%2Fbyte%2Fstrtol.html') diff --git a/devdocs/c/string%2Fbyte%2Fstrtol.html b/devdocs/c/string%2Fbyte%2Fstrtol.html deleted file mode 100644 index 5b16e65b..00000000 --- a/devdocs/c/string%2Fbyte%2Fstrtol.html +++ /dev/null @@ -1,105 +0,0 @@ -

strtol, strtoll

Defined in header <stdlib.h> 
long      strtol( const char          *str, char          **str_end, int base );
 (until C99) 
long      strtol( const char *restrict str, char **restrict str_end, int base );
-		 (since C99) 
long long strtoll( const char *restrict str, char **restrict str_end, int base );
-		 (since C99)

Interprets an integer value in a byte string pointed to by str.

-

Discards any whitespace characters (as identified by calling isspace) until the first non-whitespace character is found, then takes as many characters as possible to form a valid base-n (where n=base) integer number representation and converts them to an integer value. The valid integer value consists of the following parts:

-

The set of valid values for base is {0,2,3,...,36}. The set of valid digits for base-2 integers is {0,1}, for base-3 integers is {0,1,2}, and so on. For bases larger than 10, valid digits include alphabetic characters, starting from Aa for base-11 integer, to Zz for base-36 integer. The case of the characters is ignored.

-

Additional numeric formats may be accepted by the currently installed C locale.

-

If the value of base is ​0​, the numeric base is auto-detected: if the prefix is 0, the base is octal, if the prefix is 0x or 0X, the base is hexadecimal, otherwise the base is decimal.

-

If the minus sign was part of the input sequence, the numeric value calculated from the sequence of digits is negated as if by unary minus in the result type.

-

The functions set the pointer pointed to by str_end to point to the character past the last numeric character interpreted. If str_end is a null pointer, it is ignored.

-

If the str is empty or does not have the expected form, no conversion is performed, and (if str_end is not a null pointer) the value of str is stored in the object pointed to by str_end.

-

Parameters

- - - -
str - pointer to the null-terminated byte string to be interpreted
str_end - pointer to a pointer to character.
base - base of the interpreted integer value

Return value

Example

#include <errno.h>
-#include <limits.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
- 
-int main(void)
-{
-    // parsing with error handling
-    const char *p = "10 200000000000000000000000000000 30 -40 junk";
-    printf("Parsing '%s':\n", p);
- 
-    for (;;)
-    {
-        // errno can be set to any non-zero value by a library function call
-        // regardless of whether there was an error, so it needs to be cleared
-        // in order to check the error set by strtol
-        errno = 0;
-        char *end;
-        const long i = strtol(p, &end, 10);
-        if (p == end)
-            break;
- 
-        const bool range_error = errno == ERANGE;
-        printf("Extracted '%.*s', strtol returned %ld.", (int)(end-p), p, i);
-        p = end;
- 
-        if (range_error)
-            printf("\n --> Range error occurred.");
- 
-        putchar('\n');
-    }
- 
-    printf("Unextracted leftover: '%s'\n\n", p);
- 
-    // parsing without error handling
-    printf("\"1010\" in binary  --> %ld\n", strtol("1010", NULL, 2));
-    printf("\"12\"   in octal   --> %ld\n", strtol("12",   NULL, 8));
-    printf("\"A\"    in hex     --> %ld\n", strtol("A",    NULL, 16));
-    printf("\"junk\" in base-36 --> %ld\n", strtol("junk", NULL, 36));
-    printf("\"012\"  in auto-detected base --> %ld\n", strtol("012",  NULL, 0));
-    printf("\"0xA\"  in auto-detected base --> %ld\n", strtol("0xA",  NULL, 0));
-    printf("\"junk\" in auto-detected base --> %ld\n", strtol("junk", NULL, 0));
-}

Possible output:

-
Parsing '10 200000000000000000000000000000 30 -40 junk':
-Extracted '10', strtol returned 10.
-Extracted ' 200000000000000000000000000000', strtol returned 9223372036854775807.
- --> Range error occurred.
-Extracted ' 30', strtol returned 30.
-Extracted ' -40', strtol returned -40.
-Unextracted leftover: ' junk'
- 
-"1010" in binary  --> 10
-"12"   in octal   --> 10
-"A"    in hex     --> 10
-"junk" in base-36 --> 926192
-"012"  in auto-detected base --> 10
-"0xA"  in auto-detected base --> 10
-"junk" in auto-detected base --> 0

References

See also

- - - - -
-
(C99)
 converts a byte string to an integer value
(function)
-
(C99)
 converts a byte string to an unsigned integer value
(function)
-
(C95)(C99)
 converts a wide string to an integer value
(function)
-
(C95)(C99)
 converts a wide string to an unsigned integer value
(function)
C++ documentation for strtol, strtoll
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/string/byte/strtol -

-
-- cgit v1.2.3