/[jscoverage]/trunk/util.c
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revision 99 by siliconforks, Wed May 14 00:01:21 2008 UTC revision 106 by siliconforks, Sat May 31 07:37:39 2008 UTC
# Line 17  Line 17 
17      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */  */
19    
20    #define _GNU_SOURCE
21    
22    #include <config.h>
23    
24  #include "util.h"  #include "util.h"
25    
26  #include <assert.h>  #include <assert.h>
# Line 24  Line 28 
28  #include <limits.h>  #include <limits.h>
29  #include <stdarg.h>  #include <stdarg.h>
30  #include <stdio.h>  #include <stdio.h>
31    #include <stdint.h>
32  #include <string.h>  #include <string.h>
33  #include <strings.h>  #include <strings.h>
34    
# Line 46  Line 51 
51    exit(EXIT_FAILURE);    exit(EXIT_FAILURE);
52  }  }
53    
54    size_t addst(size_t x, size_t y) {
55      if (SIZE_MAX - x < y) {
56        fatal("integer overflow");
57      }
58      return x + y;
59    }
60    
61    size_t mulst(size_t x, size_t y) {
62      if (x == 0 || y == 0) {
63        return 0;
64      }
65      if (SIZE_MAX / x < y) {
66        fatal("integer overflow");
67      }
68      return x * y;
69    }
70    
71  void * xmalloc(size_t size) {  void * xmalloc(size_t size) {
72    void * result = malloc(size);    void * result = malloc(size);
73    if (result == NULL) {    if (result == NULL) {
# Line 70  Line 92 
92    return result;    return result;
93  }  }
94    
95    char * xstrndup(const char * s, size_t size) {
96      char * result = strndup(s, size);
97      if (result == NULL) {
98        fatal("out of memory");
99      }
100      return result;
101    }
102    
103    int xasprintf(char ** s, const char * template, ...) {
104      va_list a;
105      va_start(a, template);
106      int result = vasprintf(s, template, a);
107      va_end(a);
108      if (result < 0) {
109        fatal("out of memory");
110      }
111      return result;
112    }
113    
114  char * xgetcwd(void) {  char * xgetcwd(void) {
115    char * result = getcwd(NULL, 0);    char * result = getcwd(NULL, 0);
116    if (result == NULL) {    if (result == NULL) {
# Line 158  Line 199 
199    }    }
200  }  }
201    
202    bool str_starts_with(const char * string, const char * prefix) {
203      const char * string_ptr = string;
204      const char * prefix_ptr = prefix;
205      while (*string_ptr != '\0' && *prefix_ptr != '\0') {
206        if (*string_ptr != *prefix_ptr) {
207          return false;
208        }
209        string_ptr++;
210        prefix_ptr++;
211      }
212      if (*string_ptr == '\0' && *prefix_ptr != '\0') {
213        return false;
214      }
215      return true;
216    }
217    
218    bool str_ends_with(const char * string, const char * suffix) {
219      size_t string_length = strlen(string);
220      size_t suffix_length = strlen(suffix);
221      if (string_length < suffix_length) {
222        return false;
223      }
224      return strcmp(string + string_length - suffix_length, suffix) == 0;
225    }
226    
227  char * make_path(const char * parent, const char * relative_path) {  char * make_path(const char * parent, const char * relative_path) {
228    size_t parent_length = strlen(parent);    size_t parent_length = strlen(parent);
229    size_t relative_path_length = strlen(relative_path);    size_t relative_path_length = strlen(relative_path);
230    char * result = xmalloc(parent_length + relative_path_length + 2);    size_t result_length = addst(parent_length, relative_path_length);
231      result_length = addst(result_length, 2);
232      char * result = xmalloc(result_length);
233    strcpy(result, parent);    strcpy(result, parent);
234    result[parent_length] = '/';    result[parent_length] = '/';
235    strcpy(result + parent_length + 1, relative_path);    strcpy(result + parent_length + 1, relative_path);
# Line 288  Line 356 
356    fclose(destination);    fclose(destination);
357  }  }
358    
359  int directory_is_empty(const char * directory) {  bool directory_is_empty(const char * directory) {
360      bool result = true;
361    DIR * dir = xopendir(directory);    DIR * dir = xopendir(directory);
   int num_entries = 0;  
362    struct dirent * e;    struct dirent * e;
363    while ((e = readdir(dir)) != NULL) {    while ((e = readdir(dir)) != NULL) {
364      if (strcmp(e->d_name, ".") != 0 &&      if (strcmp(e->d_name, ".") != 0 &&
365          strcmp(e->d_name, "..") != 0) {          strcmp(e->d_name, "..") != 0) {
366        num_entries++;        result = false;
367          break;
368      }      }
369    }    }
370    closedir(dir);    closedir(dir);
371    return num_entries == 0;    return result;
372  }  }
373    
374  static struct DirListEntry * recursive_dir_list(const char * root, const char * directory_wrt_root, struct DirListEntry * head) {  static struct DirListEntry * recursive_dir_list(const char * root, const char * directory_wrt_root, struct DirListEntry * head) {
# Line 348  Line 417 
417    }    }
418  }  }
419    
420    #ifndef HAVE_CLOSESOCKET
421    int closesocket(int s) {
422      return close(s);
423    }
424    #endif
425    
426  #ifndef HAVE_VASPRINTF  #ifndef HAVE_VASPRINTF
427  int vasprintf(char ** s, const char * template, va_list a) {  int vasprintf(char ** s, const char * template, va_list a) {
428    int size = 100;    int size = 100;
# Line 360  Line 435 
435    va_copy(copy, a);    va_copy(copy, a);
436    int result = vsnprintf(*s, size, template, copy);    int result = vsnprintf(*s, size, template, copy);
437    if (result >= size) {    if (result >= size) {
     /* TODO: check for overflow? */  
438      int new_size = result;      int new_size = result;
439      if (new_size == INT_MAX) {      if (new_size == INT_MAX) {
440        free(*s);        free(*s);
441        return - 1;        return -1;
442      }      }
443      new_size++;      new_size++;
444      char * new_s = realloc(*s, new_size);      char * new_s = realloc(*s, new_size);
# Line 380  Line 454 
454    }    }
455    else if (result == -1) {    else if (result == -1) {
456      while (result == -1) {      while (result == -1) {
457        if (size > INT_MAX / 2) {        if (size == INT_MAX) {
458          free(*s);          free(*s);
459          return - 1;          return -1;
460          }
461          int new_size;
462          if (size > INT_MAX / 2) {
463            new_size = INT_MAX;
464          }
465          else {
466            new_size = 2 * size;
467        }        }
       int new_size = 2 * size;  
468        char * new_s = realloc(*s, new_size);        char * new_s = realloc(*s, new_size);
469        if (new_s == NULL) {        if (new_s == NULL) {
470          free(*s);          free(*s);
# Line 411  Line 491 
491    return result;    return result;
492  }  }
493  #endif  #endif
   
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