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/* util.c -- the kitchen sink ($Revision: 1.2 $) */
#include "es.h"
#if !HAVE_STRERROR
/* strerror -- turn an error code into a string */
static char *strerror(int n) {
extern int sys_nerr;
extern char *sys_errlist[];
if (n > sys_nerr)
return NULL;
return sys_errlist[n];
}
#endif
/* esstrerror -- a wrapper around sterror(3) */
extern char *esstrerror(int n) {
char *error = strerror(n);
if (error == NULL)
return "unknown error";
return error;
}
/* uerror -- print a unix error, our version of perror */
extern void uerror(char *s) {
if (s != NULL)
eprint("%s: %s\n", s, esstrerror(errno));
else
eprint("%s\n", esstrerror(errno));
}
/* isabsolute -- test to see if pathname begins with "/", "./", or "../" */
extern Boolean isabsolute(char *path) {
return path[0] == '/'
|| (path[0] == '.' && (path[1] == '/'
|| (path[1] == '.' && path[2] == '/')));
}
/* streq2 -- is a string equal to the concatenation of two strings? */
extern Boolean streq2(const char *s, const char *t1, const char *t2) {
int c;
assert(s != NULL && t1 != NULL && t2 != NULL);
while ((c = *t1++) != '\0')
if (c != *s++)
return FALSE;
while ((c = *t2++) != '\0')
if (c != *s++)
return FALSE;
return *s == '\0';
}
/*
* safe interface to malloc and friends
*/
/* ealloc -- error checked malloc */
extern void *ealloc(size_t n) {
extern void *malloc(size_t n);
void *p = malloc(n);
if (p == NULL) {
uerror("malloc");
exit(1);
}
return p;
}
/* erealloc -- error checked realloc */
extern void *erealloc(void *p, size_t n) {
extern void *realloc(void *, size_t);
if (p == NULL)
return ealloc(n);
p = realloc(p, n);
if (p == NULL) {
uerror("realloc");
exit(1);
}
return p;
}
/* efree -- error checked free */
extern void efree(void *p) {
extern void free(void *);
assert(p != NULL);
free(p);
}
/*
* private interfaces to system calls
*/
extern void ewrite(int fd, const char *buf, size_t n) {
volatile long i, remain;
const char *volatile bufp = buf;
for (i = 0, remain = n; remain > 0; bufp += i, remain -= i) {
interrupted = FALSE;
if (!setjmp(slowlabel)) {
slow = TRUE;
if (interrupted)
break;
else if ((i = write(fd, bufp, remain)) <= 0)
break; /* abort silently on errors in write() */
} else
break;
slow = FALSE;
}
slow = FALSE;
SIGCHK();
}
extern long eread(int fd, char *buf, size_t n) {
long r;
interrupted = FALSE;
if (!setjmp(slowlabel)) {
slow = TRUE;
if (!interrupted)
r = read(fd, buf, n);
else
r = -2;
} else
r = -2;
slow = FALSE;
if (r == -2) {
errno = EINTR;
r = -1;
}
SIGCHK();
return r;
}
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