Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>The reason for the garbage is that you never initialized <code>temp</code> to an empty string at the beginning of <code>main()</code>. You call <code>init(temp)</code> after processing each command.</p> <p>There are lots of other problems in your code:</p> <pre><code>orderedIds[i] = malloc(MAXCMD * sizeof(char*)); </code></pre> <p>Since <code>orderedIds[i]</code> is an array of char, not char*, you should multiply the size by <code>sizeof(char)</code>. Also, it's not clear why you're using <code>MAXCMD</code> as the size -- on the previous line this was the maximum number of words on a line, not the number of characters in a word.</p> <pre><code>strcpy(orderedIds[k], tok); </code></pre> <p>You should use <code>strncpy()</code> to ensure that you don't copy more than the size of <code>orderedIds[k]</code>.</p> <p>Another option would be <em>not</em> to preallocate all the <code>orderedIds[i]</code> in the first place. Instead of using <code>strcpy()</code>, use <code>strdup()</code> and assign this to <code>orderedIds[k]</code>; if you do this, you have to remember to <code>free()</code> all these strings.</p> <p>A third option is not to copy the strings at all. Just assign the pointers returned by <code>strtok()</code> to <code>orderedIds[k]</code>. But in this case you mustn't call <code>init(tmp)</code> until after you've forked.</p> <pre><code>strncpy(outputFile, orderedIds[numFile], strlen(orderedIds[numFile])); </code></pre> <p>The limit should be the size of <code>outputFile</code>, not the length of <code>orderedIds[numFile]</code>. <code>strncpy()</code> will never copy more than the length of the source, you need to tell it the maximum size of the destination to prevent a buffer overflow.</p> <pre><code>outputfd = open(outputFile, O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU | S_IRGRP | S_IROTH); if (outputfd &lt; 0) { exit(EXIT_FAILURE); } </code></pre> <p>You should call <code>perror()</code> to report the reason that <code>open()</code> failed.</p> <pre><code>puts(strerror(errno)); </code></pre> <p>Call <code>perror()</code>, like you do elsewhere.</p>
    singulars
    1. This table or related slice is empty.
    1. POIO redirection and buffer issues, fflush and c
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USBarmar
    1. USBarmar
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POIO redirection and buffer issues, fflush and c
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. CO@WhozCraig I know that, I'm recommending that he use `perror()` so that he can add that message. He does it in other parts of the program, he should do it there as well.
      singulars
      1. PO
      1. USBarmar
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload