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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1999-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Purpose: Safe memory allocation and other utilities.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "esock_utils.h"
static char *strtok_quote(char *s1, const char *s2);
void *esock_malloc(size_t size)
{
void *p;
p = malloc(size);
if (!p) {
fprintf(stderr, "esock_malloc: cannot alloc %d bytes\n", size);
exit(EXIT_FAILURE);
}
return p;
}
void *esock_realloc(void *p, size_t size)
{
void *np;
np = realloc(p, size);
if (!np) {
fprintf(stderr, "esock_realloc: cannot realloc %d bytes\n", size);
exit(EXIT_FAILURE);
}
return np;
}
void esock_free(void *p)
{
free(p);
}
/* Builds an argv array from cmd. Spaces and tabs within double quotes
* are not considered delimiters. Double quotes are removed.
*
* The return value is argc, and the pointer to char ** is set. argc
* is non-negative, argv[0], ..., argv[argc - 1] are pointers to
* strings, and argv[argc] == NULL. All argv[0], ..., argv[argc - 1]
* must be freed by the user, and also the argv pointer itself.
*
* Example: cmd = abc"/program files/"olle nisse, results in
* argv[0] = abc/program files/olle, argv[1] = nisse, argc = 2.
*
*/
int esock_build_argv(char *cmd, char ***argvp)
{
int argvsize = 10, argc = 0;
char *args, *tokp, *argp;
char **argv;
argv = esock_malloc(argvsize * sizeof(char *));
args = esock_malloc(strlen(cmd) + 1);
strcpy(args, cmd);
tokp = strtok_quote(args, " \t");
while (tokp != NULL) {
if (argc + 1 >= argvsize) {
argvsize += 10;
argv = esock_realloc(argv, argvsize * sizeof(char *));
}
argp = esock_malloc(strlen(tokp) + 1);
strcpy(argp, tokp);
argv[argc++] = argp;
tokp = strtok_quote(NULL, " \t");
}
esock_free(args);
argv[argc] = NULL;
*argvp = argv;
return argc;
}
/* strtok_quote
* Works as strtok, but characters within pairs of double quotes are not
* considered as delimiters. Quotes are removed.
*/
static char *strtok_quote(char *s1, const char *s2)
{
static char *last;
char *s, *t, *u;
s = (s1) ? s1 : last;
if (!s)
return last = NULL;
while (*s != '"' && *s != '\0' && strchr(s2, *s))
s++;
t = s;
while (1) {
if (*t == '"') {
t++;
while (*t != '"' && *t != '\0')
t++;
if (*t == '\0') {
last = NULL;
goto end;
}
t++;
}
while(*t != '"' && *t != '\0' && !strchr(s2, *t))
t++;
if (*t == '\0') {
last = NULL;
goto end;
} else if (*t != '"') {
*t = '\0';
last = t + 1;
goto end;
}
}
end:
/* Remove quotes */
u = t = s;
while (*u) {
if (*u == '"')
u++;
else
*t++ = *u++;
}
*t = '\0';
return s;
}
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