1 files changed, 109 insertions, 0 deletions
diff --git a/libnetdata/procfile/procfile.h b/libnetdata/procfile/procfile.h
new file mode 100644
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+++ b/libnetdata/procfile/procfile.h
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_PROCFILE_H
+#define NETDATA_PROCFILE_H 1
+
+#include "../libnetdata.h"
+
+// ----------------------------------------------------------------------------
+// An array of words
+
+typedef struct {
+    size_t len;     // used entries
+    size_t size;    // capacity
+    char *words[];  // array of pointers
+} pfwords;
+
+
+// ----------------------------------------------------------------------------
+// An array of lines
+
+typedef struct {
+    size_t words;   // how many words this line has
+    size_t first;   // the id of the first word of this line
+                    // in the words array
+} ffline;
+
+typedef struct {
+    size_t len;     // used entries
+    size_t size;    // capacity
+    ffline lines[]; // array of lines
+} pflines;
+
+
+// ----------------------------------------------------------------------------
+// The procfile
+
+#define PROCFILE_FLAG_DEFAULT             0x00000000 // To store inside `collector.log`
+#define PROCFILE_FLAG_NO_ERROR_ON_FILE_IO 0x00000001 // Do not store nothing
+#define PROCFILE_FLAG_ERROR_ON_ERROR_LOG  0x00000002 // Store inside `error.log`
+
+typedef enum __attribute__ ((__packed__)) procfile_separator {
+    PF_CHAR_IS_SEPARATOR,
+    PF_CHAR_IS_NEWLINE,
+    PF_CHAR_IS_WORD,
+    PF_CHAR_IS_QUOTE,
+    PF_CHAR_IS_OPEN,
+    PF_CHAR_IS_CLOSE
+} PF_CHAR_TYPE;
+
+typedef struct procfile {
+    char *filename;                 // not populated until procfile_filename() is called
+    uint32_t flags;
+    int fd;                         // the file descriptor
+    size_t len;                     // the bytes we have placed into data
+    size_t size;                    // the bytes we have allocated for data
+    pflines *lines;
+    pfwords *words;
+    PF_CHAR_TYPE separators[256];
+    char data[];                    // allocated buffer to keep file contents
+} procfile;
+
+// close the proc file and free all related memory
+void procfile_close(procfile *ff);
+
+// (re)read and parse the proc file
+procfile *procfile_readall(procfile *ff);
+
+// open a /proc or /sys file
+procfile *procfile_open(const char *filename, const char *separators, uint32_t flags);
+
+// re-open a file
+// if separators == NULL, the last separators are used
+procfile *procfile_reopen(procfile *ff, const char *filename, const char *separators, uint32_t flags);
+
+// example walk-through a procfile parsed file
+void procfile_print(procfile *ff);
+
+void procfile_set_quotes(procfile *ff, const char *quotes);
+void procfile_set_open_close(procfile *ff, const char *open, const char *close);
+
+char *procfile_filename(procfile *ff);
+
+// ----------------------------------------------------------------------------
+
+// set to the O_XXXX flags, to have procfile_open and procfile_reopen use them when opening proc files
+extern int procfile_open_flags;
+
+// set this to 1, to have procfile adapt its initial buffer allocation to the max allocation used so far
+extern int procfile_adaptive_initial_allocation;
+
+// return the number of lines present
+#define procfile_lines(ff) ((ff)->lines->len)
+
+// return the number of words of the Nth line
+#define procfile_linewords(ff, line) (((line) < procfile_lines(ff)) ? (ff)->lines->lines[(line)].words : 0)
+
+// return the Nth word of the file, or empty string
+#define procfile_word(ff, word) (((word) < (ff)->words->len) ? (ff)->words->words[(word)] : "")
+
+// return the first word of the Nth line, or empty string
+#define procfile_line(ff, line) (((line) < procfile_lines(ff)) ? procfile_word((ff), (ff)->lines->lines[(line)].first) : "")
+
+// return the Nth word of the current line
+#define procfile_lineword(ff, line, word) (((line) < procfile_lines(ff) && (word) < procfile_linewords((ff), (line))) ? procfile_word((ff), (ff)->lines->lines[(line)].first + (word)) : "")
+
+// Open file without logging file IO error if any
+#define procfile_open_no_log(filename, separators, flags) procfile_open(filename, separators, flags | PROCFILE_FLAG_NO_ERROR_ON_FILE_IO)
+
+#endif /* NETDATA_PROCFILE_H */