2013年7月2日 · strdup and strndup are defined in POSIX compliant systems as: char *strdup(const char *str); char *strndup(const char *str, size_t len); The strdup() function allocates sufficient memory for a copy of the string str, does the copy, and returns a pointer to it. The pointer may subsequently be used as an argument to the function free.

2012年12月24日 · char *strdup(char *pszSrch); strdup will allocate storage the size of the original string. If storage allocation is successful, the original string is copied to the duplicate string. strdupd return NULL on failure. If memory is not allocated, copy fails strdup return NULL.

2011年9月28日 · therefore, the MS guys decided to replace strdup with _strdup. I'd just continue using strdup. It's unlikely the C committee will define strdup to something else than POSIX. Either #define strdup _strdup or silence the warning. BTW I hope you see this applies to your functions with names like string_list etc., too.

2014年7月29日 · The strdup() function returns a pointer to a new string which is a duplicate of the string s. Memory for the new string is obtained with malloc(3), and can be freed with free(3). BTW, as Matt McNabb commented, strdup is standard in Posix, not in the C99 language specification.

strdup() isn't standard C.It is a POSIX extension.. To make strdup() available even with strict C99 compliance for GCC when using the option -std=c99 you need to #define at least one of the following:

2016年5月10日 · If you must implement your own strdup function, at least rely on the rest of string.h for as much as you can. Many of these functions are optimized, and faster than you can write them yourself. Many of these functions are optimized, and faster than you …

2013年12月3日 · I have to allocate an array of 1000 pointers to character strings, read in each character string from stdin and strdup each line into the array. I did the following: char *array[1000]; int index ...

The strdup() function shall return a pointer to a new string, which is a duplicate of the string pointed to by s. The returned pointer can be passed to free() . A null pointer is returned if the new string cannot be created.

2016年2月1日 · Use the string constructor with character and count parameters: string newRN = new string('0', 4); You could also reference the Microsoft.VisualBasic assembly and call the method via the Strings module, but the alternative above is pretty simple.

2015年11月16日 · If you're worried about portability, you probably use strdup(), though even that is only defined by POSIX (strdup()) and not by Standard C. Note that strdup() is part of TR 24731-2: Extensions to the C Library - Part II: Dynamic allocation functions. AFAIK, alloca() is not part of either POSIX or the proposed extensions to the Standard C library.