Release 4.11 tools/lib/subcmd/subcmd-util.h

#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);
}

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static NORETURN inline void die(const char *err, ...)
{
	va_list params;

	va_start(params, err);
	report(" Fatal: ", err, params);
	exit(128);
	va_end(params);
}

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#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;
}

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#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);
}

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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;
}

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#endif /* __SUBCMD_UTIL_H */
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Directory: tools/lib/subcmd

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