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#ifndef __SUBCMD_UTIL_H
#define __SUBCMD_UTIL_H
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#define NORETURN __attribute__((__noreturn__))
static inline void report(const char *prefix, const char *err, va_list params)
{
char msg[1024];
vsnprintf(msg, sizeof(msg), err, params);
fprintf(stderr, " %s%s\n", prefix, msg);
}
static NORETURN inline void die(const char *err, ...)
{
va_list params;
va_start(params, err);
report(" Fatal: ", err, params);
exit(128);
va_end(params);
}
#define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
#define alloc_nr(x) (((x)+16)*3/2)
/*
* Realloc the buffer pointed at by variable 'x' so that it can hold
* at least 'nr' entries; the number of entries currently allocated
* is 'alloc', using the standard growing factor alloc_nr() macro.
*
* DO NOT USE any expression with side-effect for 'x' or 'alloc'.
*/
#define ALLOC_GROW(x, nr, alloc) \
do { \
if ((nr) > alloc) { \
if (alloc_nr(alloc) < (nr)) \
alloc = (nr); \
else \
alloc = alloc_nr(alloc); \
x = xrealloc((x), alloc * sizeof(*(x))); \
} \
} while(0)
static inline void *xrealloc(void *ptr, size_t size)
{
void *ret = realloc(ptr, size);
if (!ret && !size)
ret = realloc(ptr, 1);
if (!ret) {
ret = realloc(ptr, size);
if (!ret && !size)
ret = realloc(ptr, 1);
if (!ret)
die("Out of memory, realloc failed");
}
return ret;
}
#define astrcatf(out, fmt, ...) \
({ \
char *tmp = *(out); \
if (asprintf((out), "%s" fmt, tmp ?: "", ## __VA_ARGS__) == -1) \
die("asprintf failed"); \
free(tmp); \
})
static inline void astrcat(char **out, const char *add)
{
char *tmp = *out;
if (asprintf(out, "%s%s", tmp ?: "", add) == -1)
die("asprintf failed");
free(tmp);
}
static inline int prefixcmp(const char *str, const char *prefix)
{
for (; ; str++, prefix++)
if (!*prefix)
return 0;
else if (*str != *prefix)
return (unsigned char)*prefix - (unsigned char)*str;
}
#endif /* __SUBCMD_UTIL_H */
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