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HP-UX Reference Volume 4 of 5 > s
strtol(3C) |
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NAMEstrtol(), atol(), atoi(), strtoul() — convert string to integer SYNOPSIS#include <stdlib.h> long strtol(const char *str, char **ptr, int base); long atol(const char *str); int atoi(const char *str); unsigned long strtoul(const char *str, char **ptr, int base); DESCRIPTIONstrtol() (strtoul()) converts the character string pointed to by str to long int (unsigned long int) representation. The string is scanned up to the first character inconsistent with the base. Leading ``white-space'' characters (as defined by isspace() in ctype(3C)) are ignored. If no conversion can take place, zero is returned. If base is greater than or equal to 2 and less than or equal to 36, it is used as the base for conversion. After an optional leading sign, leading zeros are ignored, and 0x or 0X is ignored if base is 16. If base is zero, the string itself determines the base as follows: After an optional leading sign, a leading zero indicates octal conversion; a leading 0x or 0X hexadecimal conversion. Otherwise, decimal conversion is used. If the value of ptr is not (char **)NULL, a pointer to the character terminating the scan is returned in the location pointed to by ptr. If no integer can be formed, the location pointed to by ptr is set to str, and zero is returned. atol(str) is equivalent to strtol(str, (char **)NULL, 10). atoi(str) is equivalent to int strtol(str, (char **)NULL, 10). RETURN VALUEUpon successful completion, all functions return the converted value, if any. If the correct value would cause overflow, strtol() returns LONG_MAX or LONG_MIN (according to the sign of the value), and sets errno to ERANGE; strtoul() returns ULONG_MAX and sets errno to ERANGE. Overflow conditions are ignored by atol() and atoi(). For all other errors, zero is returned and errno is set to indicate the error. |
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