stat - C - size of a file from an absolute path -


question: there means obtain file's size off_t absolute file path when file path relative current working directory not known

this may marked duplicate believe sufficiently varys questions such this or this not wish use relative path.

like many folk -it appears- fell trap of assuming when looking obtain file information stat() used absolute rather relative (to current working directory) pathnames. have absolute path file need identify size of off_t. second issue discovered absolute pathnames -aside pointing in wrong place- may exceed path_max limits.h?.

the function below found here offers means obtain off_t relative path. return no such file or directory via errno absolute path because uses stat().

#include <sys/stat.h> #include <string.h> #include <stdio.h> #include <errno.h>  off_t fsize(const char *filename) {     struct stat st;      if (stat(filename, &st) == 0)         return st.st_size;      fprintf(stderr, "cannot determine size of %s: %s\n",             filename, strerror(errno));      return -1; }

because know ask; advised chdir() neither thread safe nor practice; should avoid changing current working directory. advised steer clear of fseek() there no rationale given why..

stat(2) allows specify file using it's full path name root directory (if path starts /) or relative 1 (otherwise, see path_resolution(7)), current directory. if don't know of names (in case yo have open file descriptor, , don't know name of file) have possibility of making fstat(2) system call.

be careful fact file size can change between stat(2) call make know file size , whatever after. think on opening o_append flag if want assure write not interspesed others'.


-

Comments

Post a Comment

Popular posts from this blog

c# - Binding a comma separated list to a List<int> in asp.net web api -

the default binder in web api expecst http://url.com/webapi/report/?pageids=3243&pageids=2365 to bind public ihttpactionresult report(list<int> pageids){ // exciting webapi code} i wish bind http://url.com/webapi/report/?pageids=3243,2365 as running out of space in url get . i have created class public class commaseparatedmodelbinder : system.web.http.modelbinding.imodelbinder { public bool bindmodel(httpactioncontext actioncontext, modelbindingcontext bindingcontext) { //binding in here } } and registered in webapiconfig.cs var provider = new simplemodelbinderprovider( typeof(list<int>), new commaseparatedmodelbinder()); config.services.insert(typeof(modelbinderprovider), 0, provider); i have altered method signature use model binder so public ihttpactionresult report( [modelbinder] list<int> pageids){ // exciting webapi code} however break point in binder not being
Read more

Delphi 7 and decode UTF-8 base64 -

in delphi 7, have widestring encoded base64(that received web service widestring result) : pd94bwwgdmvyc2lvbj0ims4wij8+dqo8c3ryaw5nptiq2lpyqjwvc3ryaw5npg== when decoded it, result not utf-8: <?xml version="1.0"?> <string>طھط³طھ</string> but when decoded base64decode.org, result true : <?xml version="1.0"?> <string>تست</string> i have use encddecd unit decodestring function. the problem have using decodestring . function, in delphi 7, treats decoded binary data being ansi encoded. , problem text utf-8 encoded. to continue encddecd unit have couple of options. can switch decodestream . instance, code produce utf-8 encoded text file data: {$apptype console} uses classes, encddecd; const data = 'pd94bwwgdmvyc2lvbj0ims4wij8+dqo8c3ryaw5nptiq2lpyqjwvc3ryaw5npg=='; var input: tstringstream; output: tfilestream; begin input := tstringstream.create(data); try output := tfilestream.
Read more

html - Is there any way to exclude a single element from the style? (Bootstrap) -

so, have img logo, overlaid on div styled background-image: url("...") , , both elements inside 2 div classes .to-color , .to-overlay respectively, black transparent overlay. is there way exclude logo style given these 2 classes? here's jsfiddle example: link html , css example: - html - <div class="to-color"> <div class="to-overlay"> <div class="respo"> <div class="row"> <div class="col-xs-4 col-xs-offset-4 text-center"> <img src="http://ansonalex.com/wp-content/uploads/2011/06/google-logo-768x260.png" alt="..." class="img-responsive"> </div> </div> </div> </div> </div> - css - .to-color { background-color: #000; } .to-overlay { opacity : 0.5; } .respo { background-image: url("https://source.unsplash.com/category/objects/1600x900"); background-position: center center;
Read more