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/*
** util.c
**
** Made by (Matthieu Lucotte)
** Login <gounter@users.sourceforge.net>
**
** Started on Tue Oct 2 20:28:27 2001 Matthieu Lucotte
** Last update Mon Sep 1 23:01:34 2003
*/
#include "zssh.h"
/* shift position i by n chars
* Ex : str_shift("1234567",2,3) -> "1267"
* |||
*/
void str_shift(str,i,n)
char *str;
int i;
int n;
{
int j;
for (j = i;str[j + n];j++)
str[j] = str[j + n];
str[j] = str[j + n];
}
char *str_n_dup(str,n)
char *str;
int n;
{
char *pt;
int i;
int len;
len = min(strlen(str),n);
pt = smalloc(len + 1);
for (i = 0;i < len;i++)
pt[i] = str[i];
pt[len] = 0;
return (pt);
}
char *str_cat(str1,str2)
char *str1;
char *str2;
{
int i;
int len1;
int len2;
char *str_res;
len1 = strlen(str1);
len2 = strlen(str2);
if ((str_res = smalloc(len1 + len2 + 1)) == 0)
return (0);
for (i = 0;i < len1;i++)
str_res[i] = str1[i];
for (i = 0;i <= len2;i++)
str_res[len1 + i] = str2[i];
return (str_res);
}
void str_sub_repl(str,sub_beg,sub_len,sub_repl)
char **str;
int sub_beg;
int sub_len;
char *sub_repl;
{
char *s1;
char *s2;
s1 = s2 = str_n_dup(*str,sub_beg);
s1 = str_cat(s1,sub_repl);
free(s2);
s2 = s1;
s1 = str_cat(s1,*str + sub_beg + sub_len);
free(s2);
free(*str);
*str = s1;
}
void *smalloc(n)
unsigned int n;
{
void *pt;
if ((pt = malloc(n)) != 0)
return (pt);
error(0, "malloc");
exit (1);
}
/*int sfork() */
/*{ */
/* int pid; */
/* */
/* pid = fork(); */
/* if (pid == -1) */
/* error(0,"fork"); */
/* return (pid); */
/*} */
/* sfork(): Exits if unable to fork
* if pid_child is non zero, also avoids race condition that would occur
* if the child's pid must be known by the parent *before* the child dies.
*/
int sfork(volatile int *pid_child)
{
sigset_t mask;
sigset_t old_mask;
int pid;
sigprocmask(SIG_SETMASK, 0, &old_mask); /* save mask */
sigprocmask(SIG_SETMASK, 0, &mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_SETMASK, &mask, 0); /* block SIGCHLD */
pid = fork();
if (pid == -1)
error(0, "fork");
if (pid) /* parent process */
if (pid_child)
*pid_child = pid;
sigprocmask(SIG_SETMASK, &old_mask, 0); /* restore old mask */
return (pid);
}
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