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/* utils.c: functions of general utility */
#include "rc.h"
#include <errno.h>
#include <setjmp.h>
#include "jbwrap.h"
/* print error with line number on noninteractive shells (i.e., scripts) */
extern void pr_error(char *s, int offset) {
if (s != NULL) {
if (interactive)
fprint(2, RC "%s\n", s);
else
fprint(2, RC "line %d: %s\n", lineno + offset, s);
}
}
/* our perror */
extern void uerror(char *s) {
char *err;
err = strerror(errno);
if (!err) err = "unknown error";
if (s)
fprint(2, RC "%s: %s\n", s, err);
else
fprint(2, RC "%s\n", err);
}
/* Die horribly. This should never get called. Please let me know if it does. */
#define PANICMSG "rc panic: "
extern void panic(char *s) {
write(2, PANICMSG, conststrlen(PANICMSG));
write(2, s, strlen(s));
write(2, "!\n", 2);
exit(1);
}
/* ascii -> unsigned conversion routines. -1 indicates conversion error. */
extern int n2u(char *s, unsigned int base) {
unsigned int i;
for (i = 0; *s != '\0'; s++) {
unsigned int j = (unsigned int) *s - '0';
if (j >= base) /* small hack with unsigned ints -- one compare for range test */
return -1;
i = i * base + j;
}
return (int) i;
}
/* The last word in portable ANSI: a strcmp wrapper for qsort */
extern int starstrcmp(const void *s1, const void *s2) {
return strcmp(*(char * const *)s1, *(char * const *)s2);
}
/* tests to see if pathname begins with "/", "./", or "../" */
extern bool isabsolute(char *path) {
return path[0] == '/' || (path[0] == '.' && (path[1] == '/' || (path[1] == '.' && path[2] == '/')));
}
/* duplicate a fd and close the old one only if necessary */
extern int mvfd(int i, int j) {
if (i != j) {
int s = dup2(i, j);
close(i);
return s;
}
return 0;
}
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