63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
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#include "cstr.h"
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#include <ctype.h>
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#include <string.h>
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/**
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* trim whitespace of a cstring (both beginning and end). a null terminator
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* will be placed after the last non-whitespace character. this modifies the
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* string.
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*
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* @param str: the string to trim
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*
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* @return a pointer to the beginning of the trimmed string. the string is not
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* copied, and the returned pointer points to somewhere within the
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* original string.
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*/
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char *
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strtrim (char *str)
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{
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strtrimr (str);
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return strtriml (str);
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}
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/**
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* trim whitespace of a cstring on the left (beginning of string). the original
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* string will be preserved.
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*
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* @param str: the string to trim
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*
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* @return a pointer to the beginning of the trimmed string. the string is not
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* copied, and the returned pointer points to somewhere within the
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* original string.
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*/
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char *
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strtriml (const char *str)
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{
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while (*str && isspace (*str))
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str++;
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return str;
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}
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/**
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* trim whitespace of a cstring on the right (end of string). a null terminator
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* will be placed after the last non-whitespace character. this modifies the
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* string.
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*
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* @param str: the string to trim
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*
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* @return the new string length
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*/
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size_t
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strtrimr (char *str)
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{
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size_t len, i;
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i = len = strlen (str);
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while (i <= len && isspace (str[i - 1]))
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i--;
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str[i] = '\0';
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return i;
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}
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