LXR linux/tools/lib/subcmd/subcmd-util.h

   1#ifndef __SUBCMD_UTIL_H
   2#define __SUBCMD_UTIL_H
   3
   4#include <stdarg.h>
   5#include <stdlib.h>
   6#include <stdio.h>
   7
   8#define NORETURN __attribute__((__noreturn__))
   9
  10static inline void report(const char *prefix, const char *err, va_list params)
  11{
  12        char msg[1024];
  13        vsnprintf(msg, sizeof(msg), err, params);
  14        fprintf(stderr, " %s%s\n", prefix, msg);
  15}
  16
  17static NORETURN inline void die(const char *err, ...)
  18{
  19        va_list params;
  20
  21        va_start(params, err);
  22        report(" Fatal: ", err, params);
  23        exit(128);
  24        va_end(params);
  25}
  26
  27#define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
  28
  29#define alloc_nr(x) (((x)+16)*3/2)
  30
  31/*
  32 * Realloc the buffer pointed at by variable 'x' so that it can hold
  33 * at least 'nr' entries; the number of entries currently allocated
  34 * is 'alloc', using the standard growing factor alloc_nr() macro.
  35 *
  36 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
  37 */
  38#define ALLOC_GROW(x, nr, alloc) \
  39        do { \
  40                if ((nr) > alloc) { \
  41                        if (alloc_nr(alloc) < (nr)) \
  42                                alloc = (nr); \
  43                        else \
  44                                alloc = alloc_nr(alloc); \
  45                        x = xrealloc((x), alloc * sizeof(*(x))); \
  46                } \
  47        } while(0)
  48
  49static inline void *xrealloc(void *ptr, size_t size)
  50{
  51        void *ret = realloc(ptr, size);
  52        if (!ret && !size)
  53                ret = realloc(ptr, 1);
  54        if (!ret) {
  55                ret = realloc(ptr, size);
  56                if (!ret && !size)
  57                        ret = realloc(ptr, 1);
  58                if (!ret)
  59                        die("Out of memory, realloc failed");
  60        }
  61        return ret;
  62}
  63
  64#define astrcatf(out, fmt, ...)                                         \
  65({                                                                      \
  66        char *tmp = *(out);                                             \
  67        if (asprintf((out), "%s" fmt, tmp ?: "", ## __VA_ARGS__) == -1) \
  68                die("asprintf failed");                                 \
  69        free(tmp);                                                      \
  70})
  71
  72static inline void astrcat(char **out, const char *add)
  73{
  74        char *tmp = *out;
  75
  76        if (asprintf(out, "%s%s", tmp ?: "", add) == -1)
  77                die("asprintf failed");
  78
  79        free(tmp);
  80}
  81
  82static inline int prefixcmp(const char *str, const char *prefix)
  83{
  84        for (; ; str++, prefix++)
  85                if (!*prefix)
  86                        return 0;
  87                else if (*str != *prefix)
  88                        return (unsigned char)*prefix - (unsigned char)*str;
  89}
  90
  91#endif /* __SUBCMD_UTIL_H */
  92