1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __SUBCMD_UTIL_H 3 #define __SUBCMD_UTIL_H 4 5 #include <stdarg.h> 6 #include <stdlib.h> 7 #include <stdio.h> 8 9 #define NORETURN __attribute__((__noreturn__)) 10 report(const char * prefix,const char * err,va_list params)11 static inline void report(const char *prefix, const char *err, va_list params) 12 { 13 char msg[1024]; 14 vsnprintf(msg, sizeof(msg), err, params); 15 fprintf(stderr, " %s%s\n", prefix, msg); 16 } 17 die(const char * err,...)18 static NORETURN inline void die(const char *err, ...) 19 { 20 va_list params; 21 22 va_start(params, err); 23 report(" Fatal: ", err, params); 24 exit(128); 25 va_end(params); 26 } 27 28 #define zfree(ptr) ({ free(*ptr); *ptr = NULL; }) 29 30 #define alloc_nr(x) (((x)+16)*3/2) 31 32 /* 33 * Realloc the buffer pointed at by variable 'x' so that it can hold 34 * at least 'nr' entries; the number of entries currently allocated 35 * is 'alloc', using the standard growing factor alloc_nr() macro. 36 * 37 * DO NOT USE any expression with side-effect for 'x' or 'alloc'. 38 */ 39 #define ALLOC_GROW(x, nr, alloc) \ 40 do { \ 41 if ((nr) > alloc) { \ 42 if (alloc_nr(alloc) < (nr)) \ 43 alloc = (nr); \ 44 else \ 45 alloc = alloc_nr(alloc); \ 46 x = xrealloc((x), alloc * sizeof(*(x))); \ 47 } \ 48 } while(0) 49 xrealloc(void * ptr,size_t size)50 static inline void *xrealloc(void *ptr, size_t size) 51 { 52 void *ret = realloc(ptr, size); 53 if (!ret) 54 die("Out of memory, realloc failed"); 55 return ret; 56 } 57 58 #define astrcatf(out, fmt, ...) \ 59 ({ \ 60 char *tmp = *(out); \ 61 if (asprintf((out), "%s" fmt, tmp ?: "", ## __VA_ARGS__) == -1) \ 62 die("asprintf failed"); \ 63 free(tmp); \ 64 }) 65 astrcat(char ** out,const char * add)66 static inline void astrcat(char **out, const char *add) 67 { 68 char *tmp = *out; 69 70 if (asprintf(out, "%s%s", tmp ?: "", add) == -1) 71 die("asprintf failed"); 72 73 free(tmp); 74 } 75 76 #endif /* __SUBCMD_UTIL_H */ 77