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retval(1): make C and Rust code similar

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dtb 2024-04-18 22:45:11 -06:00
parent b1f90eff11
commit f3893c4da1
1 changed files with 14 additions and 13 deletions
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27
retval/retval.c
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@ -3,21 +3,22 @@
#include <stdlib.h> /* strtol(3) */ #include <stdlib.h> /* strtol(3) */
#include <sysexits.h> /* EX_USAGE */ #include <sysexits.h> /* EX_USAGE */
static char *program_name = "retval"; int usage(char *s){
fprintf(stderr, "Usage: %s [status]\n", s == NULL ? "retval" : s);
return EX_USAGE;
}
int main(int argc, char *argv[]){ int main(int argc, char *argv[]){
unsigned int s;
if(argc < 2) switch(argc){
goto usage; case 2: { unsigned int s;
errno = 0;
errno = 0; s = strtol(argv[1], &argv[1], 10);
s = strtol(argv[1], &argv[1], 10); if(*argv[1] != '\0' || errno != 0){
if(*argv[1] != '\0' || errno != 0){ return usage(argv[0]);
usage: fprintf(stderr, "Usage: %s [status]\n", }
argv[0] == NULL ? program_name : argv[0]); return s;
return EX_USAGE; }
default: return usage(argv[0]);
} }
return s;
} }