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This is something you are probably NOT supposed to be doing with #perl but consider my innocent looking C code found in an Inline::C region (which will be discussed in my talk).
If my understanding of the API is correct, then this macro allocates a buffer of known size in bytes and puts the buffer under the #Perl garbage collector. One only needs an entry point from Perl to #C and one just enhanced their #Clang code with a garbage collector
for safe memory management.
@Perl
![// macro for the creation of a new SV buffer of a given size w/o resizing
#define NEW_SV_BUFFER(sv, buf , buffer_size) \
SV *sv = newSV(0); \
char *buf; \
Newxz(buf,buffer_size,char); \
sv_usepvn_flags(sv, buf, buffer_size,SV_HAS_TRAILING_NUL|SV_SMAGIC)](https://static.mstdn.science/media_attachments/files/112/606/723/666/501/228/original/2c164b87ad21056c.png "// macro for the creation of a new SV buffer of a given size w/o resizing
#define NEW_SV_BUFFER(sv, buf , buffer_size) \
SV *sv = newSV(0); \
char *buf; \
Newxz(buf,buffer_size,char); \
sv_usepvn_flags(sv, buf, buffer_size,SV_HAS_TRAILING_NUL|SV_SMAGIC)")