cmd.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 #include "debug.h"
   6
   7 #include "cmd.h"
   8
   9 #define BUFFERSIZE 4096
  10
  11 static char *_read_stream (FILE *sd)
  12 {
  13     char *buffer = NULL;
  14     size_t size = 0;
  15     do {
  16         size += BUFFERSIZE + (size == 0);
  17         buffer = (char *) realloc (buffer, size);
  18         memset (buffer + size - BUFFERSIZE - 1, 0, BUFFERSIZE + 1);
  19         fread (buffer + size - BUFFERSIZE - 1, 1, BUFFERSIZE, sd);
  20     } while (!feof (sd));
  21
  22     /* check size */
  23     if (buffer[0] == '\0') {
  24         free (buffer);
  25         buffer = NULL;
  26     }
  27
  28     return buffer;
  29 }
  30
  31 char *exec_cmd (char *cmd)
  32 {
  33     int status = -1;
  34     char *buffer = NULL;
  35
  36     VERBOSE (DEBUG, fprintf (stdout, "exec command: %s\n", cmd));
  37     FILE *fp = popen (cmd, "r");
  38     if (fp != NULL) {
  39         buffer = _read_stream (fp);
  40         status = pclose(fp);
  41     }
  42
  43     if ((status == -1) || (buffer == NULL)) {
  44         free (buffer);
  45         buffer = NULL;
  46     }
  47
  48     return buffer;
  49 }
  50
  51 char *load_file (char *name)
  52 {
  53     int status = -1;
  54     char *buffer = NULL;
  55
  56     VERBOSE (DEBUG, fprintf (stdout, "open file: %s\n", name));
  57     FILE *fd = fopen (name, "r");
  58     if (fd != NULL) {
  59         buffer = _read_stream (fd);
  60         status = fclose (fd);
  61     }
  62
  63     if (status == -1) {
  64         free (buffer);
  65         buffer = NULL;
  66     }
  67
  68     return buffer;
  69 }
  70
  71 char *read_stdin (void)
  72 {
  73     char *buffer = NULL;
  74
  75     VERBOSE (DEBUG, fprintf (stdout, "read stdin\n"));
  76     buffer = _read_stream (stdin);
  77
  78     return buffer;
  79 }
  80
  81 char **split_lines (char *buffer, int max)
  82 {
  83     int n = 0;
  84
  85     char **lines = NULL;
  86     int i, j;
  87     char *line = (char *) calloc (max + 1, sizeof (char));
  88     for (i = j = 0; buffer[i] != '\0'; i++) {
  89         if (buffer[i] >= ' ') {
  90             line[j++] = buffer[i];
  91         }
  92         if ((j == max) || (buffer[i] == '\n')) {
  93             lines = (char **) realloc (lines, (n + 2) * sizeof (char *));
  94             lines[n] = line;
  95             lines[n + 1] = NULL;
  96             line = calloc (max + 1, sizeof (char));
  97             n++;
  98             j = 0;
  99         }
 100     }
 101     if (line[0] != '\0') {
 102         lines = (char **) realloc (lines, (n + 2) * sizeof (char *));
 103         lines[n++] = line;
 104     } else {
 105         free (line);
 106     }
 107     VERBOSE (DEBUG, fprintf (stdout, "split lines: %d\n", n));
 108
 109     return lines;
 110 }
 111
 112 void free_lines (char **lines)
 113 {
 114     int i = 0;
 115
 116     while (lines[i]) {
 117         free (lines[i++]);
 118     }
 119     free (lines);
 120 }
 121
 122 /* vim: set ts=4 sw=4 et: */