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read_historyF.c
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read_historyF.c
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#include "shell.h"
/**
* read_history - reads history from file
* @info: the parameter struct
*
* Return: histcount on success, 0 otherwise
*/
int read_history(info_t *info)
{
int i, last = 0, linecount = 0;
ssize_t fd, rdlen, fsize = 0;
struct stat st;
char *buf = NULL, *filename = get_history_file(info);
if (!filename)
return (0);
fd = open(filename, O_RDONLY);
free(filename);
if (fd == -1)
return (0);
if (!fstat(fd, &st))
fsize = st.st_size;
if (fsize < 2)
return (0);
buf = malloc(sizeof(char) * (fsize + 1));
if (!buf)
return (0);
rdlen = read(fd, buf, fsize);
buf[fsize] = 0;
if (rdlen <= 0)
return (free(buf), 0);
close(fd);
for (i = 0; i < fsize; i++)
if (buf[i] == '\n')
{
buf[i] = 0;
build_history_list(info, buf + last, linecount++);
last = i + 1;
}
if (last != i)
build_history_list(info, buf + last, linecount++);
free(buf);
info->histcount = linecount;
while (info->histcount-- >= HIST_MAX)
delete_node_at_index(&(info->history), 0);
renumber_history(info);
return (info->histcount);
}