Zilog EZ80F916 - Manual (Page 378)

UM014423-0607 C Standard Library
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eZ80Acclaim! ® User Manual
358
realloc
Changes the size of the object pointed to by ptr to the size specified by
size
. The contents
of the object are unchanged up to the lesser of the new and old sizes. If ptr is a null pointer,
the
realloc function behaves like the malloc function for the specified size. Otherwise,
if ptr does not match a pointer earlier returned by the calloc , malloc , or realloc func-
tion, or if the space has been deallocated by a call to the free or realloc function, the
behavior is undefined. If the space cannot be allocated, the realloc function returns a
null pointer and the object pointed to by ptr is unchanged. If size is zero, the realloc
function returns a null pointer and, if ptr is not a null pointer, the object it points to is freed.
Synopsis
#include
void *realloc(void *ptr, size_t size);
Returns
Returns a pointer to the start (lowest byte address) of the possibly moved object.
Example
char *buf;
buf=(char *) malloc(40*sizeof(char));
buf=(char *) realloc(buf, 80*sizeof(char));
if(buf !=NULL)
/*success*/
else
/*fail*/
scanf
Reads input from the stream pointed to by stdin, under control of the string pointed to by
format that specifies the admissible input sequences and how they are to be converted for
assignment, using subsequent arguments as pointers to the object to receive the converted
input. If there are insufficient arguments for the format, the behavior is undefined. If the
format is exhausted while arguments remain, the excess arguments are evaluated but oth-
erwise ignored.
The format is composed of zero or more directives from the following list:
•
one or more white-space characters
•
an ordinary character (not %)
•
a conversion specification
Each conversion specification is introduced by the character %. After the %, the following
appear in sequence:
•
An optional assignment-suppressing character *.